diff --git a/main.cpp b/main.cpp
index 47b917d..dd7b794 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,23 +1,20 @@
 #include <iostream>
-
-using std::cout;
-using std::cin;
-using std::endl;
+//comment
 
 int main(){
   double first, second;
 
-  cout<< "First number: ";
-  cin>> first;
-  cout<< "Second number: ";
-  cin>> second;
+  std::out<< "First number: ";
+  std::cin>> first;
+  std::cout<< "Second number: ";
+  std::cin>> second;
 
-  cout<< "Addition: "<< first << "+" << second << "=";
-  cout<< (first+second) << endl;
-  cout<< "Subtraction: "<< first << "-" << second << "=";
-  cout<< (first-second) << endl;
-  cout<< "Multiplication: "<< first << "*" << second << "=";
-  cout<< (first*second) << endl;
+  std::cout<< "Addition: "<< first << "+" << second << "=";
+  std::cout<< (first+second) << std::endl;
+  std::cout<< "Subtraction: "<< first << "-" << second << "=";
+  std::cout<< (first-second) << std::endl;
+  std::cout<< "Multiplication: "<< first << "*" << second << "=";
+  std::cout<< (first*second) << std::endl;
 
   return 0;
-}
\ No newline at end of file
+}