import sequtils,strutils,math

var
    k = stdin.readline.parseInt
    a,b,t,n : float64
    flag : bool
    M,m : float64
    s : string
for i in 1..k:
    (a,b,t) = stdin.readline.split.map(parseFloat)
    n = 1.0
    m = 0.0
    M = 1.0
    flag = true
    while true:
        if pow(n,a) * pow(ln(n),b) <= t:
            m = n
            n += 1.0
        else:
            break
    M = n
    while M - m > 0.000_000_001:
        n = (M + m) / 2.0
        if pow(n,a) * pow(ln(n),b) <= t:
            m = n
        else:
            M = n
    s = $n
    echo s[0..11]