kangaroo.java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static String kangaroo(int x1, int v1, int x2, int v2) {
        if(x2>x1&&v2>v1)
            return "NO";
           //int flag=1;
        //if(x1==x2)return "YES";
        while(x1<=x2)
            {
            if(x1==x2)
                {
               // flag=0;
                return "YES";
            }
            else{ x1+=v1;
                x2+=v2;}
                
            }
        return "NO";
        // Complete this function
    }

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int x1 = in.nextInt();
        int v1 = in.nextInt();
        int x2 = in.nextInt();
        int v2 = in.nextInt();
        String result = kangaroo(x1, v1, x2, v2);
        System.out.println(result);
    }
}