function Main(input) {
		input = input.split(" ");
		const num1 = parseInt(input[0], 10);
		const num2 = parseInt(input[1], 10);
		const num3 = parseInt(input[2], 10);
		console.log(num1 + num2 + num3 <= 21 ? 'win' : 'bust');
}
Main(require("fs").readFileSync("/dev/stdin", "utf8"));