View Compilation Error

0_0_17431882_24829.cpp: In function 'int main()':
0_0_17431882_24829.cpp:5:2: error: 'int64' was not declared in this scope
  int64 a[56];
  ^
0_0_17431882_24829.cpp:10:19: error: 'a' was not declared in this scope
    scanf("%I64d",&a[i]);
                   ^
0_0_17431882_24829.cpp:12:9: error: expected ';' before 'ans'
   int64 ans = 0;
         ^
0_0_17431882_24829.cpp:15:4: error: 'ans' was not declared in this scope
    ans+=a[i];
    ^
0_0_17431882_24829.cpp:15:9: error: 'a' was not declared in this scope
    ans+=a[i];
         ^
0_0_17431882_24829.cpp:21:20: error: 'ans' was not declared in this scope
   printf("%I64d\n",ans);
                    ^