View Compilation Error

0_0_19690292_29700.cpp: In function 'int main()':
0_0_19690292_29700.cpp:6:5: error: '_int64' was not declared in this scope
     _int64 A, B;
     ^
0_0_19690292_29700.cpp:9:16: error: 'A' was not declared in this scope
         cin >> A >> B;
                ^
0_0_19690292_29700.cpp:9:21: error: 'B' was not declared in this scope
         cin >> A >> B;
                     ^