def main():
    A = int(input())
    i = 0
    while True:
        i += 1
        tmp = 2**i
        if tmp >= A:
            break
    ans2 = 2*i

    j = 0
    while True:
        j += 1
        tmp = 3**j
        if tmp >= A:
            break
    ans3 = 3*j

    #print(ans2,ans3)

    ans = min(ans2,ans3)
    return ans

print(main())