#include<iostream>
#include<cstdio>
//#include<string.h>
#include<cmath>
//#include<bitset>
#include<string>
//#include<vector>
//#include<algorithm>
//#include<functional>
using namespace std;
string s;
int h,n=13;
int main(){
int n;
cin>>n;
    if(n==4)
    cout<<3;
else 
if(n==6)cout<<-1;
else cout<<0;
}

相信我，可以A