import std.stdio;
import std.string, std.conv;
import std.algorithm, std.array;
import std.typecons;

void main() {
  for(;;) {
    auto s = readln.split.map!(to!int).array;
    int N = s[0], M = s[1];
    if(N == 0 && M == 0) break;
    if((N * M) % 2 == 0) writeln("yes");
    else writeln("no");
  }
}