#include <bits/stdc++.h>

using namespace std;

#define FOR(i, a, b) for(int i = (a); i < (b); i++)
#define RFOR(i, a, b) for(int i = (a) - 1; i >= (b); i--)
#define SZ(a) int(a.size())
#define ALL(a) a.begin(), a.end()
#define PB push_back
#define MP make_pair
#define F first
#define S second

typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PII;
typedef double db;

bool gua()
{
	int b, r, d, s;
	cin >> b >> r >> d >> s;
	if(r == 0)
		return d > 0;
	
	return (s * r / 60 + 1) * b < d;
}

int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	int t;
	cin >> t;
	while(t--)
	{
		cout << (gua() ? "gua!" : "ok") << "\n";
	}
	return 0;
}