백준 10872 - Java

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Factorial {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        int fact = 1;
        for (int i = 1; i <= N; i++) {
            fact *= i;
        }
        System.out.println(fact);
    }
}