
#include<bits/stdc++.h>
using namespace std;
#define MOD 1000000007
#define BIG 1000000010
#define repi(i,x,n) for(int i=x;i<n;i++)
#define rep(i,n) repi(i,0,n)
#define repn(i,n) for(int i=n;i>=0;i--)
typedef long long int ll;


int main(){
  int h,w,x,y;
  cin>>h>>w>>x>>y;
  if(h%2==1 && w%2==1 && (x+y)%2==1){
   cout<<"No"<<endl;
  }
  else cout<<"Yes"<<endl;

  return 0;
}





