// 2019 IUSB Programming Competition
// Round 1 Problem 6
// Can you reach a destination point from a source point
// Solution by Liguo Yu


import java.util.Scanner;

public class round1_p6
{
	public static void main(String[] main)
	{
		Scanner scan = new Scanner(System.in);
		int x1 = scan.nextInt();
		int y1 = scan.nextInt();
		int x2 = scan.nextInt();
		int y2 = scan.nextInt();
		
		if ( isReachable(x1, y1, x2, y2) == true) System.out.println("yes");
		else System.out.println("no");
	}
	
	public static boolean isReachable(int sx, int sy, int dx, int dy)
	{
		if (sx > dx || sy > dy) return false;
		else if (sx == dx && sy == dy) return true;
		else return (isReachable(sx + sy, sy, dx, dy) || isReachable(sx, sy + sx, dx, dy));
	}
}