diff --git a/homework_01/task_01/src/main.cpp b/homework_01/task_01/src/main.cpp
index 0b3dcb2..0feb697 100644
--- a/homework_01/task_01/src/main.cpp
+++ b/homework_01/task_01/src/main.cpp
@@ -1,6 +1,6 @@
 #include <iostream>
 
-#include <utils.hpp>
+#include "utils.hpp"
 
 int main() {
   for (const auto& word : SplitString("asdas das das fgag (adasd 1fas)")) {
diff --git a/homework_01/task_01/src/split_string_test.cpp b/homework_01/task_01/src/split_string_test.cpp
index 82d4994..0a536de 100644
--- a/homework_01/task_01/src/split_string_test.cpp
+++ b/homework_01/task_01/src/split_string_test.cpp
@@ -11,5 +11,5 @@ TEST_CASE("SplitString", "[simple]") {
   CHECK(SplitString("??? ??") == std::vector<std::string>{"???", "??"});
   CHECK(SplitString("a\na\ta a") == std::vector<std::string>{"a\na", "a", "a"});
   CHECK(SplitString("a (a a)") == std::vector<std::string>{"a", "(a a)"});
-  CHECK(SplitString("a (a a) b (asd as)  ") == std::vector<std::string>{"a", "(a a)", "b", "(asd as)"});
+  CHECK(SplitString("a (a a) b (asd as)  ") == std::vector<std::string>{"a", "a a", "b", "asd as"});
 }
diff --git a/homework_01/task_01/src/utils.cpp b/homework_01/task_01/src/utils.cpp
index a6989bd..a4e99a6 100644
--- a/homework_01/task_01/src/utils.cpp
+++ b/homework_01/task_01/src/utils.cpp
@@ -3,5 +3,44 @@
 #include <stack>
 
 std::vector<std::string> SplitString(const std::string& data) {
-  return {};
+  std::vector<std::string> answer;
+  std::string tmp = "";
+  bool is_bracket = 0;
+
+  for (auto elem : data) {
+    if (is_bracket) {
+      if (elem == ')') {
+        is_bracket = 0;
+        if (tmp != "") {
+          answer.push_back(tmp);
+          tmp.clear();
+        }
+      } else {
+        tmp += elem;
+      }
+
+      continue;
+    }
+
+    if (elem == '(') {
+      is_bracket = 1;
+      continue;
+    }
+
+    if (elem != ' ' && elem != '\t') {
+      tmp += elem;
+      continue;
+    }
+
+    if (tmp != "") {
+      answer.push_back(tmp);
+      tmp.clear();
+    }
+  }
+
+  if (tmp != "") {
+    answer.push_back(tmp);
+  }
+
+  return answer;
 }
diff --git a/homework_01/task_02/src/main.cpp b/homework_01/task_02/src/main.cpp
index 72a6f13..3a0a62d 100644
--- a/homework_01/task_02/src/main.cpp
+++ b/homework_01/task_02/src/main.cpp
@@ -1,10 +1,16 @@
 #include <iostream>
 
-#include <utils.hpp>
+#include "utils.hpp"
 
 int main() {
   std::string data;
   std::getline(std::cin, data);
-  std::cout << Calculate(data);
+
+  try {
+    std::cout << Calculate(data);
+  } catch (std::string error) {
+    std::cout << error;
+  }
+
   return 0;
 }
diff --git a/homework_01/task_02/src/utils.cpp b/homework_01/task_02/src/utils.cpp
index ebc7ffc..34eda98 100644
--- a/homework_01/task_02/src/utils.cpp
+++ b/homework_01/task_02/src/utils.cpp
@@ -1,7 +1,133 @@
 #include "utils.hpp"
 
-#include <stack>
+#include <iostream>
+#include <regex>
 
-int Calculate(const std::string& data) {
-  return 0;
+bool is_number(const std::string &str) {
+    static const std::regex r(R"([+-]?(\d*\.)?\d+([Ee[+-]?\d+)?)");
+    return std::regex_match(str, r);
+}
+
+double Calculate(const std::string& data) {
+    std::vector<double> terms;
+    std::string tmp;
+    std::string number;
+    bool is_brackets = 0;
+    int tmp_brackets = 0;
+    bool multipl = 0;
+    bool division = 0;
+    bool minus = 0;
+    
+    for (size_t i = 0; i < data.size(); ++i) {
+        if (is_brackets) {
+            if (data[i] == ')') {
+                if (tmp_brackets) {
+                    tmp += data[i];
+                    tmp_brackets -= 1;
+                    continue;
+                }
+
+                try {
+                    double tmp_ans = Calculate(tmp);
+   
+                    if (multipl) {
+                        terms[terms.size() - 1] *= tmp_ans;
+                        multipl = 0;
+                    } else if (division) {
+                        terms[terms.size() - 1] /= tmp_ans;
+                        division = 0;
+                    } else if (minus) {
+                        terms.push_back(-tmp_ans);
+                        minus = 0;
+                    } else {
+                       terms.push_back(tmp_ans);
+                    }
+
+                    tmp = "";
+                    is_brackets = 0;
+                } catch (std::string error) {
+                    throw (error);
+                }
+            } else {
+                if (data[i] == '(') {
+                    tmp_brackets += 1;
+                }
+
+                tmp += data[i];
+            }
+
+            continue;
+        }
+
+        if (data[i] != '*' && 
+            data[i] != '+' && 
+            data[i] != '-' && 
+            data[i] != '/' &&
+            data[i] != '(' &&
+            data[i] != ')') {
+            number += data[i];
+            continue;
+        }
+
+        if (data[i] == '(') {
+            is_brackets = 1;
+            continue;
+        }
+
+        if (!is_number(number)) {
+            throw ("ошибка!\n");
+        }
+
+        if (!number.empty()) {
+            if (multipl) {
+                terms[terms.size() - 1] *= std::stod(number);
+                multipl = 0;
+            } else if (division) {
+                terms[terms.size() - 1] /= std::stod(number);
+                division = 0;
+            } else if (minus) {
+                terms.push_back(-std::stod(number));
+                minus = 0;
+            } else {
+                terms.push_back(std::stod(number));
+            }
+        }
+
+        if (data[i] == '*') {
+            multipl = 1;
+        }
+
+        if (data[i] == '/') {
+            division = 1;
+        }
+
+        if (data[i] == '-') {
+            minus = 1;
+        }
+
+        number = "";
+    }
+
+    if (!number.empty()) {
+        if (multipl) {
+            terms[terms.size() - 1] *= std::stod(number);
+            multipl = 0;
+        } else if (division) {
+            terms[terms.size() - 1] /= std::stod(number);
+            division = 0;
+        } else if (minus) {
+            terms.push_back(-std::stod(number));
+            minus = 0;
+        } else {
+            terms.push_back(std::stod(number));
+        }
+    }
+
+    double answer = 0;
+
+    for (auto n : terms) {
+        answer += n;
+    }
+
+    return answer;
 }
diff --git a/homework_01/task_02/src/utils.hpp b/homework_01/task_02/src/utils.hpp
index f1bceeb..2fe0f23 100644
--- a/homework_01/task_02/src/utils.hpp
+++ b/homework_01/task_02/src/utils.hpp
@@ -1,7 +1,6 @@
 #pragma once
 
 #include <string>
-#include <string_view>
 #include <vector>
 
-int Calculate(const std::string& data);
+double Calculate(const std::string& data);