View Compilation Error

0_0_13936111_18197.cpp: In function 'int main()':
0_0_13936111_18197.cpp:8:2: error: '_int64' was not declared in this scope
  _int64 n;
  ^
0_0_13936111_18197.cpp:9:9: error: expected ';' before 'a'
  _int64 a;
         ^
0_0_13936111_18197.cpp:10:9: error: expected ';' before 'b'
  _int64 b;
         ^
0_0_13936111_18197.cpp:11:9: error: expected ';' before 't'
  _int64 t;
         ^
0_0_13936111_18197.cpp:12:17: error: 'n' was not declared in this scope
  scanf("%I64d",&n);
                 ^
0_0_13936111_18197.cpp:15:28: error: 'a' was not declared in this scope
   scanf("%I64d%I64d%I64d",&a,&b,&t);
                            ^
0_0_13936111_18197.cpp:15:31: error: 'b' was not declared in this scope
   scanf("%I64d%I64d%I64d",&a,&b,&t);
                               ^
0_0_13936111_18197.cpp:15:34: error: 't' was not declared in this scope
   scanf("%I64d%I64d%I64d",&a,&b,&t);
                                  ^