package main

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

var sc = bufio.NewScanner(os.Stdin)

func main() {
	n := nextInt()
	fmt.Println(gcd(n, (n*(n+1))/2-n))
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func gcd(a, b int) int {
	for ; b != 0; b, a = a%b, b {
	}
	return a
}