Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

C. Mike and Chocolate Thieves

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputBad news came to Mike's village, some thieves stole a bunch of chocolates from the local factory! Horrible!

Aside from loving sweet things, thieves from this area are known to be very greedy. So after a thief takes his number of chocolates for himself, the next thief will take exactly *k* times more than the previous one. The value of *k* (*k* > 1) is a secret integer known only to them. It is also known that each thief's bag can carry at most *n* chocolates (if they intend to take more, the deal is cancelled) and that there were exactly four thieves involved.

Sadly, only the thieves know the value of *n*, but rumours say that the numbers of ways they could have taken the chocolates (for a fixed *n*, but not fixed *k*) is *m*. Two ways are considered different if one of the thieves (they should be numbered in the order they take chocolates) took different number of chocolates in them.

Mike want to track the thieves down, so he wants to know what their bags are and value of *n* will help him in that. Please find the smallest possible value of *n* or tell him that the rumors are false and there is no such *n*.

Input

The single line of input contains the integer *m* (1 ≤ *m* ≤ 10^{15}) — the number of ways the thieves might steal the chocolates, as rumours say.

Output

Print the only integer *n* — the maximum amount of chocolates that thieves' bags can carry. If there are more than one *n* satisfying the rumors, print the smallest one.

If there is no such *n* for a false-rumoured *m*, print - 1.

Examples

Input

1

Output

8

Input

8

Output

54

Input

10

Output

-1

Note

In the first sample case the smallest *n* that leads to exactly one way of stealing chocolates is *n* = 8, whereas the amounts of stealed chocolates are (1, 2, 4, 8) (the number of chocolates stolen by each of the thieves).

In the second sample case the smallest *n* that leads to exactly 8 ways is *n* = 54 with the possibilities: (1, 2, 4, 8), (1, 3, 9, 27), (2, 4, 8, 16), (2, 6, 18, 54), (3, 6, 12, 24), (4, 8, 16, 32), (5, 10, 20, 40), (6, 12, 24, 48).

There is no *n* leading to exactly 10 ways of stealing chocolates in the third sample case.

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Jun/23/2017 23:48:28 (c2).

Desktop version, switch to mobile version.

User lists

Name |
---|