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Problems

Factorial

Factorial

Time limit 1 second
Memory limit 128 MiB

Find the factorial of a number.

Input data

One integer n~(0 \le n \le 20).

Output data

Print the value of n! = 1 \cdot 2 \cdot 3 \cdot ... \cdot n.

Examples

Input example #1
3
Output example #1
6