#include<bits/stdc++.h>
using namespace std;
int n,m;
int main(){
	cin>>n;
	if(n%4==1){
		cout<<"红色";
	}
	if(n%4==2){
		cout<<"绿色";
	}
	if(n%4==3){
		cout<<"黄色";
	}
	if(n%4==0){
		cout<<"绿色";
	}
} 

??????????????????????

#include <iostream>
#include <algorithm>
#include <cmath>
#include <cstdio>
using namespace std;
int n;int main() {
	cin >> n;
	int l = n % 4;
	int x;if (l == 1)
		cout << "红色";
	else if (l == 2)
		cout << "蓝色";
	else if (l == 3)
		cout << "黄色";
	else if (l == 0)
		cout << "绿色";
}