#include <bits/stdc++.h>
using namespace std;

int main() {
	int h, w, x, y;
	cin >> h >> w >> x >> y;
	if(h * w % 2 == 1 && (x + y) % 2 == 1) {
		cout << "No" << endl;
	}
	else {
		cout << "Yes" << endl;
	}
}

