import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.PriorityQueue;
import java.util.Scanner;

public class Main {
	
	public static final long MOD = 1000000007l;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong() % MOD;
		long answer = 1;
		
		
		for(int i = 2; i <= N; i++){
			answer *= i;
			answer %= MOD;
		}
		
		System.out.println(answer);
	}
}