题解：因为137*73=10001，则将值对10001取模。
#include<iostream>
#include<cstring>
#include<cstdio>
#define mod 10001using namespace std;
const int maxn = 1e7 + 5;
char a[maxn];
int main()
{int kase = 0;while(~scanf("%s", a)){int ans = 0;for (int i = 0; i < strlen(a); i++){ans = (int)(((long long) ans * 10 + a[i] - '0')%mod);}if(ans == 0){printf("Case #%d: YES\n", ++kase);}else{printf("Case #%d: NO\n", ++kase);}}
}