#include<iostream>
#include<vector>
#include<string>
#include<algorithm>
using namespace std;
long long ni(long long ta, vector<long long> & v) {

}
long long rui(long long n, long long k, long long p) {
	if (k == 0) {
		return 1;
	}
	else {
		long long a = rui(n, k / 2, p);
		if (k % 2 == 0) {
			return (a*a) % p;
		}
		return (((a*a) % p)*n) % p;
	}
}
int main(){
	int h, w, x, y;
	cin >> h >> w >> x >> y;
	if (h*w*(x + y) % 2 == 1) {
		cout << "No" << endl;
	}
	else {
		cout << "Yes" << endl;
	}
	return 0;
}
