function main(arg) {
  var sum = arg.split(' ').reduce(function(a, b) {
    a = a + Number(b)
    return a
  }, 0)

  if (sum > 21) {
    console.log('bust')
  } else {
    console.log('win')
  }
}

main(require('fs').readFileSync('/dev/stdin', 'utf8'))