View Compilation Error

0_0_32817258_29712.cpp: In function 'int main()':
0_0_32817258_29712.cpp:3:2: error: '_int64' was not declared in this scope
  _int64 a[60],i,n;//用long long存取，因为当n较大时数会很大，保险起见
  ^
0_0_32817258_29712.cpp:4:25: error: 'n' was not declared in this scope
  while(scanf("%I64d\n",&n)!=EOF){
                         ^
0_0_32817258_29712.cpp:5:9: error: 'a' was not declared in this scope
         a[0]=0;
         ^
0_0_32817258_29712.cpp:9:7: error: 'i' was not declared in this scope
   for(i = 4; i <= n; i++){
       ^