import java.util.*;

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