#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cmath>
#include<algorithm>
#include<cstring>
#include<sstream>
#include<vector>
#include<queue>
#include<stack>
#include<string>
#include<climits>
#include<map>
#include<set>
#define REP(i,s,n) for(int i=s;i<n;i++)
#define rep(i,n) REP(i,0,n)
#define INF 1<<30
#define F first
#define S second
using namespace std;
typedef pair<int,int> P;

int main(){
  int r,c;
  while(true){
    cin >> r >> c;
    if(r+c == 0)break;
    (r*c)%2==0 ?cout << "yes" << endl:cout << "no" << endl;
  }
return 0;
}