View Compilation Error

0_0_23644079_31266.cpp: In function 'int main()':
0_0_23644079_31266.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 a[60],n,i;
  ^
0_0_23644079_31266.cpp:5:25: error: 'n' was not declared in this scope
  while (scanf("%I64d", &n)!=EOF)
                         ^
0_0_23644079_31266.cpp:7:3: error: 'a' was not declared in this scope
   a[0] = 0;
   ^
0_0_23644079_31266.cpp:10:9: error: 'i' was not declared in this scope
   for ( i = 4; i <= n; ++i)
         ^