View Compilation Error

0_0_28373332_18898.cpp:3:1: error: '_int64' does not name a type
 _int64 hanoi(int N,int K)
 ^
0_0_28373332_18898.cpp: In function 'int main()':
0_0_28373332_18898.cpp:18:29: error: 'hanoi' was not declared in this scope
   printf("%I64d\n",hanoi(N,K));
                             ^