#include <bits/stdc++.h>
using namespace std;

int main() {
    int T;
    cin >> T;
    while(T--) {
        long long V, X;
        int F0, F1, Q, R;
        cin >> V >> X >> F0 >> F1 >> Q >> R;
        string ans("Unknown");
        if(X == X + (F1 - F0) * R - F0 * (Q - R)) {
            ans = "Safe";
        }
        while(ans == "Unknown") {
            if(X + (F1 - F0) * R <= 0) {
                ans = "Zero";
                continue;
            }
            if(V < X + (F1 - F0) * R) {
                ans = "Overflow";
                continue;
            }
            if(X + (F1 - F0) * R - F0 * (Q - R) <= 0) {
                ans = "Zero";
                continue;
            }
            X = X + (F1 - F0) * R - F0 * (Q - R);
        }
        cout << ans << endl;
    }
    return 0;
}