function main()
    t = int(input())
    for _ = 1:t
        v, x, fo, fi, q, r = int(inputs())
        if x + (fi - fo) * r - fo * (q - r) == x
            println("Safe")
        elseif x + (fi - fo) * r - fo * (q - r) < x
            println("Zero")
        else
            println("Overflow")
        end
    end
end
# --------input func----------
input() = readline()
inputs() = split(readline())
int(s::AbstractChar) = parse(Int, s)
int(s::AbstractString) = parse(Int, s)
int(v::AbstractArray) = map(x -> parse(Int, x), v)
debug(x...) = println(stderr, x...)
isfile("myinput.txt") && (mystdin = open("myinput.txt", "r"); redirect_stdin(mystdin))
main()
@isdefined(mystdin) && close(mystdin)