#include<cstdio>
#include<functional>
#include<algorithm>
#include<cstring>
using namespace std;
int main(void)
{
	int h,w,x,y,a,b;
	scanf("%d %d %d %d",&h,&w,&x,&y);
	a=h*w;
	b=x+y;
	if(a%2==1 && b%2==1)	printf("No\n");
	else printf("Yes\n");
	return 0;
}
