View Compilation Error

0_0_33270301_27303.cpp: In function 'void solve()':
0_0_33270301_27303.cpp:44:51: error: invalid operands of types 'long long int' and '<unresolved overloaded function type>' to binary 'operator<<'
     int a,b; while(cin >>a  >> b) cout < a + b << endl;
                                                   ^