2295: Question 3: Help ZhouZhenTao

One day, ZhouZhenTao and XiangRunYe were playing games. Xiang said to Zhou: I literally said a number N, if you can calculate the factorial of N in 1 seconds, I will just admire you in ZUFE from now on! Now Zhou wants to totally defeat Xiang, but he can’t calculate the answer soon, so please to help him solve the problem.

Have multiple sets of test data, input an integer N in each test data.

For each set of test data, output an integer, means the factorial of N.

Proposition：ZUFE_ZZT Translator：Angie