T = int(input())

for _ in range(T):
    V, X, Fo, Fi, Q, R = map(int, input().split())
    if X+(Fi-Fo)*R > V:
        print("Overflow")
        continue
    A = (Fi-Fo)*R-Fo*(Q-R)
    if A == 0:
        print("Safe")
    elif A > 0:
        print("Overflow")
    else:
        print("Zero")