View Compilation Error

0_0_21052139_12761.cpp: In function 'int main()':
0_0_21052139_12761.cpp:8:2: error: '_int64' was not declared in this scope
  _int64 m, x;
  ^
0_0_21052139_12761.cpp:10:9: error: expected ';' before 'p'
  _int64 p;
         ^
0_0_21052139_12761.cpp:18:25: error: 'm' was not declared in this scope
   scanf("%s %I64d", n, &m);
                         ^
0_0_21052139_12761.cpp:31:4: error: 'p' was not declared in this scope
    p = sum%m;
    ^
0_0_21052139_12761.cpp:41:4: error: 'p' was not declared in this scope
    p = sum%m;
    ^