#include <cstdlib>
#include <iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
#include<fstream>
#include<deque>
#include<cmath>
#define LL long long int
using namespace std;
#define Maxn 100010
#define  M 1000000000
#define lowbit(x) (x&(-x))
int n,m;
int main()
{
    while(~scanf("%d%d",&n,&m))
    {
        if(n==0&&m==0) break;
        n=(n*m)%2;
        if(n) printf("no\n");else printf("yes\n");
    }
    return 0;
}