// Arup Guha
// 8/18/2026
// Solution to 2026 UCF Locals Problem: More and Cheaper!

using namespace std;
#include <iostream>

int main() {

    // Read all the input.
    int a,b,c,d;
    cin >> a >> b >> c >> d;

    // ab is bulk, cd is need.
    if (a*b <= c*d)
        cout << "bulk" << endl;
    else
        cout << "need" << endl;

    return 0;
}