function main(arg) {
    var a1 = arg.split(/\s+/g)[0];
    var a2 = arg.split(/\s+/g)[1];
    var a3 = arg.split(/\s+/g)[2];
    var sum = parseInt(a1)+parseInt(a2)+parseInt(a3);
    if(sum>=22){
    	console.log("bust");
    }else{
    	console.log("win");
    }
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));