Kangroo.java

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

public class kangaroo {

    static String kangaroo(int x1, int v1, int x2, int v2) {
        // Complete this function
     while((x1*v1 <10000) && (x2*v2) <10000)
     {
        if((x1*v1) == (x2.v2))
        {
            return "YES";
        }
        else
        {
            return "NO";
        }
     }

    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);
    }
}