using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new string[t];
        for (var u = 0; u < t; ++u)
        {
            var c = NList;
            var (v, x, fo, fi, q, r) = (c[0], c[1], c[2], c[3], c[4], c[5]);
            var mid = x + (fi - fo) * r;
            var end = x + fi * r - fo * q;
            if (mid > v) ans[u] = "Overflow";
            else if (end < 0) ans[u] = "Zero";
            else if (end > x) ans[u] = "Overflow";
            else if (end < x) ans[u] = "Zero";
            else ans[u] = "Safe";
        }
        WriteLine(string.Join("\n", ans));
    }
}