def main():
    n = int(input())
    ans = float("inf")
    for j in range(100):
        ok = 0
        ng = int(1e19)
        while ng - ok > 1:
            mid = (ok + ng) // 2
            if pow(mid, j) <= n:
                ok = mid
            else:
                ng = mid
        ans = min(ans, ok + j + (n - pow(ok, j)))
    print(ans)
main()