import java.util.*;
import java.io.*;
import java.math.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        long m = sc.nextLong();
        long max_2 = 1;
        int cnt = 0;
        for(int i = 1; i <= 128; i++){
            max_2 *= 2;
            if(max_2 >= m){
                cnt = i;
                break;
            }
        }
        long ans = max_2 % m;
        for(int i = cnt+1; i <= 128; i++){
            ans = (ans*2)%m;
        }
        System.out.println(ans);
    }
}