#include <cmath>
#include <iostream>
#include <string>
using namespace std;
 
long binary_decimal(string num) /* Function to convert binary to dec */
{
	long dec = 0, n = 1, exp = 0;
	string bin = num;
	if (bin.length() > 1020) {
		cout << "Binary Digit too large" << endl;
	} else {
		for (int i = bin.length() - 1; i > -1; i--) {
			n = pow(2, exp++);
			if (bin.at(i) == '1')
				dec += n;
		}
	}
	return dec;
}
 
int main()
{
	std::string str;
	while (std::cin >> str) {
		std::cout << binary_decimal(str) << '\n';
	}
}
 

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101
01111111111111111111111111111111
11111111111111111111111111111111
1111111111111111111111111111111111