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- #include <iostream>
- #include <vector>
- #include <set>
- #include <cstring>
- using namespace std;
- int main() {
- string s;
- cin >> s;
- int power_of_two = 1;
- int number = 0;
- for(int i = s.size() - 1; i >= 0; i--) {
- if(s[i] == '1') {
- number += power_of_two;
- }
- power_of_two *= 2;
- }
- cout << number << endl;
- return 0;
- }
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