class Fill(object): def __init__(self): pass def constructor(self, data): data = list(map(int, data)) self.H = data[0] self.W = data[1] self.N = data[2] self.K = data[3] def run(self): self.analysis() def analysis(self): if self.H*self.W % self.N == self.K % self.N: print("Yes") else: print("No") if __name__=="__main__": data = input().split(" ") func = Fill() func.constructor(data) func.run()