import java.util.ArrayDeque;
import java.util.Arrays;
import java.util.Scanner;

class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	void run() {
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		if (N > 120) {
			System.out.println("000000000000");
			return;
		}
		long ans = 1;
		boolean f = false;
		for (long i = 1; i <= N; ++i) {
			if (ans * i >= (long) 1e12)
				f = true;
			ans = (ans * i) % ((long) 1e12);
		}
		if (f) {
			int[] arr = new int[12];
			for (int i = 0; i < 12; ++i) {
				arr[i] = (int) (ans % 10);
				ans /= 10;
				if (ans == 0)
					break;
			}
			for (int i = arr.length - 1; i >= 0; --i) {
				System.out.print(arr[i]);
			}
			System.out.println();
			return;
		}
		System.out.println(ans);
	}

	void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}