(function(input) {
  'use strict';
 
  input.split("\n").forEach(function(line) {
    var tokens = line.split(' ').map(Number);
    let a = parseInt(tokens[0], 10)
    let b = parseInt(tokens[1], 10)
    let res = !((a % 2 == 0) && (b % 2 == 0))
    if (res) {
      console.log('yes')
    } else {
      console.log('no')
    }
  });
})(require('fs').readFileSync('/dev/stdin', 'utf8'));