#include <bits/stdc++.h>

using namespace std;


int main() {
    string s = "10101101";
    int n = 0;

    int k = 0;
    for (int i = s.size() - 1; i >= 0; i--) {
        int x = s[i] - '0';
        n += x * (1 << k);// x* pow(2,n)
        k++;
    }
    cout << n << endl;
    return 0;
}