#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#define ARRAY_NUM 100000

void factorial_calc(); // No.500
void delete_7();
void check_575();
//void jenga();   //
//void poker();

int main(void) {

	factorial_calc();

	return 0;
}

void factorial_calc() {
	int n=0, sum=0;

	scanf("%d", &n);

	sum = n;
	while (n--) {  // n回ループ
		if(n == 0){
			break;
		}
		sum *= n;
	}

	printf("%d\n", sum % (int) pow(10, 12));
}