#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
#define int long long
signed main() {
	int h, w, x, y; cin >> h >> w >> x >> y;
	h *= w; x += y;
	h %= 2; x %= 2;
	cout << (h&&x ? "No\n" : "Yes\n");
}
