Binary to decimal

import java.util.*;

class Main {

	static void findDeci(long n){
		
		long result = 0;
		int multiply = 1;
		while(n>0){

			long temp = n%10;

			result += temp*multiply;
			multiply *= 2; 
			n /= 10;

		}
		System.out.println(result);

	}

	public static void main(String args[]) {
		// Your code goes here
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		
		findDeci(n);
	}
}