import std.algorithm;
import std.array;
import std.conv;
import std.math;
import std.range;
import std.stdio;
import std.string;

void main() {
  int s;
  foreach (t; 0 .. 3) {
    int n;
    readf (" %d", &n);
    s += n;
  }
  writeln (s >= 22 ? "bust" : "win");
}

