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")
    else:
        d = fi*r-fo*q
        if d<0:
            print("Zero")
        elif d==0:
            print("Safe")
        else:
            print("Overflow")