please help. I don't know what to do
package com.codegym.task.task04.task0416;
/*
Crossing the road blindly
*/
import java.util.Scanner;
import java.io.*;
public class Solution {
public static void main(String[] args) throws Exception {
//write your code here
Scanner input = new Scanner(System.in);
double t= input.nextDouble();
int n= (int)Math.ceil(t) ;
if(n%3==1)
System.out.println("green");
else if(n%3==0)
System.out.println("yellow");
else if (n%2==0)
System.out.println("red");
}
}