View Compilation Error

0_0_17621209_22741.cpp: In function 'int main()':
0_0_17621209_22741.cpp:4:2: error: '_int64' was not declared in this scope
  _int64 a[100],n,i;
  ^
0_0_17621209_22741.cpp:5:2: error: 'a' was not declared in this scope
  a[0]=1;
  ^
0_0_17621209_22741.cpp:9:6: error: 'i' was not declared in this scope
  for(i=4;i<100;i++)
      ^
0_0_17621209_22741.cpp:11:23: error: 'n' was not declared in this scope
  while(scanf("%I64d",&n)!=EOF)
                       ^