package main

import (
	"fmt"
	"os"
	"strconv"
)

var numFinal int = 1

func main() {
	if len(os.Args) < 2 || len(os.Args) > 2 {
		fmt.Println("Usage: ./factorial 10")
		os.Exit(1)
	}

	arg := os.Args[1]

	numFactorial, err := strconv.Atoi(arg)
	if err != nil {
		fmt.Println(err)
	}

	for i := 1; i <= numFactorial; i++ {
		numFinal = numFinal * i
	}

	fmt.Println("El número factorizado es:", numFinal)
}