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

#include <iostream>
using namespace std;

bool isReachable(int sx, int sy, int dx, int dy);

int main()
{
	int x1, y1, x2, y2;
	cin >> x1;
	cin >> y1;
	cin >> x2;
	cin >> y2;
	
	bool yes = isReachable(x1, y1, x2, y2);
	
	if ( yes == true) cout << "yes";
	else cout << "no";
	
	return 0;
}  

bool 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)); 
}