C++ :

#include<bits/stdc++.h>
using namespace std;
int a,b;
int main()
{
	cin>>a>>b;
    if(a%2==0&&b%2==0) cout<<"yes";
    else{
    	if(a%2==1&&b%2==1) cout<<"yes";
    	else{
    		cout<<"no";
    	}
    }
}