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];

  writeln((N%2 == 0 || M%2 == 0)?"YES":"NO");
}