function Main(input) {
    var args = input.trim().split(' ').map(function(val) {
        return Number(val);
    });
    var sum = args[0] + args[1] + args[2];
    if(sum >= 22) {
        console.log('bust');
    } else {
        console.log('win');
    }
    
}
 
/*  var input = `13 7 2`;
Main(input);
 */ 
Main(require("fs").readFileSync("/dev/stdin", "utf8"));