`use strict`

function Main(input) {
  input = input.trim().split(' ').map(s => parseInt(s))

  const result = input.reduce((a, b) => a + b)
  if(result >= 22) {
    console.log('bust')
  } else {
    console.log('win')
  }
  
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));