#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 + (long long)(F1 - F0) * (long long)R - (long long)F0 * (long long)(Q - R)) {
            ans = "Safe";
        }
        long long firstX = X;
        if(ans == "Unknown") {
            for(int i = 0; (i <= 100010); i++) {
                X += (long long)(F1 - F0) * (long long)R;
                if(V < X) {
                    ans = "Overflow";
                    break;
                }
                if(X <= 0LL) {
                    ans = "Zero";
                    break;
                }
                X -= (long long)F0 * (long long)(Q - R);
                if(X <= 0LL) {
                    ans = "Zero";
                    break;
                }

                if(i == 100000) {
                    if(X < firstX) {
                        ans = "Zero";
                    }else {
                        ans = "Overflow";
                    }
                }
            }
        }
        cout << ans << endl;
    }
    return 0;
}