#include<bits/stdc++.h>
using namespace std;
using Int = long long;
template<typename T1,typename T2> inline void chmin(T1 &a,T2 b){if(a>b) a=b;}
template<typename T1,typename T2> inline void chmax(T1 &a,T2 b){if(a<b) a=b;}

//INSERT ABOVE HERE
signed 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;
}

