package main

import (
	"fmt"
	"math"
)

func main() {
	var n int
	_, _ = fmt.Scan(&n)
	mod := int(math.Pow10(12))

	ans := 1
	for i := 1; i <= n; i++ {
		ans = (ans * (i % mod)) % mod
		if ans == 0 {
			break
		}
	}

	fmt.Printf("%012d\n", ans)
}