View Compilation Error

0_0_30489956_30717.cpp: In function 'int main()':
0_0_30489956_30717.cpp:41:9: error: 'cout' was not declared in this scope
         cout << F(N, M) << endl;
         ^
0_0_30489956_30717.cpp:41:28: error: 'endl' was not declared in this scope
         cout << F(N, M) << endl;
                            ^