import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long d = sc.nextLong();
        long min = d;
        long left = 0;
        long right = d;
        while (right - left > 1) {
            long m = (left + right) / 2;
            long x = 1;
            long sum = 0;
            while (x <= m && sum <= d) {
                sum += m / x;
                if (sum == d) {
                    min = Math.min(min, m);
                }
                x <<= 1;
            }
            if (sum < d) {
                left = m;
            } else {
                right = m;
            }
        }
        System.out.println(min);
    }
}