import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	H, W, N, K = getlist()
	if N == K:
		if (H * W) % N == 0:
			print("YES")
		else:
			print("NO")
	else:	
		if (H * W) % N == K:
			print("YES")
		else:
			print("NO")
	




if __name__ == '__main__':
	main()