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package com.gmail.vhrushyn;

import java.util.Scanner;

public class main {

	public static void main(String[] args) {

		System.out.println("input binary number");
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
// long because of opportunity to type a big number of '1' and '0' (up to 19)
		String s = Long.toString(n);
// method 'Long.parseLong(s, 2)' has been found in Internet... use libraries so don't need to invent a bicycle
		int a = (int) Long.parseLong(s, 2);
		System.out.println(a);
		sc.close();
		

	}

}