编辑代码

#include <iostream>
using namespace std;
#define ll long long 
ll a;
const ll mod =5;
inline ll read(){
    int x=0;
    bool flag =1;
    char ch=getchar();
    while(ch<'0'||ch>'9'){
        if(ch=='-')
            flag=0;
        ch=getchar();
    }
    while(ch>='0'&& ch<='9'){
        x=(x<<1)+(x<<3)+ch-'0';
        x%=mod;
        ch=getchar();
    }
    if(flag)
        return x;
    else
    return ~(x-1);
}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    a=read();
    cout<<a<<endl;
	return 0;
}