import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long n = sc.nextInt();
        System.out.println(gcd(n, n * (n + 1) / 2));
    }
    
    static long gcd(long x, long y) {
        if (x % y == 0) {
            return y;
        } else{
            return gcd(y, x % y);
        }
    }
}