View Compilation Error

0_0_17031335_30074.cpp: In function 'int main()':
0_0_17031335_30074.cpp:42:26: error: 'cout' was not declared in this scope
             if(tmp >= n) cout<<tmp<<endl;//printf("%I64d\n", tmp);
                          ^
0_0_17031335_30074.cpp:42:37: error: 'endl' was not declared in this scope
             if(tmp >= n) cout<<tmp<<endl;//printf("%I64d\n", tmp);
                                     ^