#include <iostream>

using namespace std;

int main()
{
  int r,c,rlu;

  while(1){
    cin>>r>>c;

    if(r == 0 && c == 0){
      break;
    }

    rlu = r	* c;

    if(rlu % 2 == 0){
      cout<<"yes"<<endl;
    }
    else{
      cout<<"no"<<endl;
    }
  }
  return 0;
}