Factorial (for loop) | Exact Science

Factorial (for loop)

Problem Statement

Compute N! (factorial of N) — the product of all natural numbers from 1 to N.

N! = 1 × 2 × 3 × … × N

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Input

A single natural number N (1 ≤ N ≤ 12).

Output

Print the value of N!.

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Example

input	output
3	6

Factorial (for loop)

Binomial Coefficient

Geometric Progression

For Loop Sum – 1

For Loop Sum – 2