You cannot submit for this problem because the contest is ended. You can click "Open in Problem Set" to view this problem in normal mode.

zzy的排列难题

由于zzy上课觉的 排 雷 列 太难了 所以让你来帮他做 数血题

有n个人，求！ 有多少种排列组合！

input！

n(0<n<40)

print！

有多少种排列组合！

3

oh! 6