#include <bits/stdc++.h>
#define sp ' '
#define nyan "(=^・ω・^=)"
#define mkp make_pair
#define lP pair<ll,ll>
#define iP pair<int,int>

typedef long long ll;
using namespace std;
const int mod = 1e9 + 7;

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;
	}
	return 0;
}

