import std.stdio, std.conv, std.math, std.string, std.range, std.array,
       std.algorithm;

void main(){
  auto buf = readln().strip().split().map!(to!int)();
  immutable N = buf[0];
  immutable M = buf[1];

  if(N==1 || M==1) {
    if(N+M==3) {
      writeln("YES");
    } else {
      writeln("NO");
    }
  } else {
    if(N%2==0 || M%2==0) {
      writeln("YES");
    } else {
      writeln("NO");
    }
  }
}