View Compilation Error

0_0_22941058_16325.cpp: In function 'int main()':
0_0_22941058_16325.cpp:27:9: error: 'cout' was not declared in this scope
         cout << ans << endl;
         ^
0_0_22941058_16325.cpp:27:24: error: 'endl' was not declared in this scope
         cout << ans << endl;
                        ^