import java.math.BigInteger;
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 = 1000000000000l;

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		final long N = sc.nextLong();
		
		BigInteger value = BigInteger.ONE;
		for(long i = 2; i <= Math.min(N, 120); i++){
			final BigInteger next_value = value.multiply(BigInteger.valueOf(i));
			value = next_value;
		}
		
		final int length = value.toString().length();
		if(length <= 12){
			System.out.println(value);
		}else{
			final BigInteger mod = value.mod(BigInteger.valueOf(MOD));
			
			System.out.println(mod.equals(BigInteger.ZERO) ? "000000000000" : String.format("%012d", mod.longValue()));
		}
	}
}