#include <bits/stdc++.h>
using namespace std;
const int m = 10000 * 100000 + 7;
int main() {
  string s;
  cin >> s;
  int n = s.length();
  long long p = 0, q = 1;
  for (int i = n - 1; i > 0; --i) {
    if (s[i] == '1') p = (p + q) % m;
    q = q * 2 % m;
  }
  if (s[0] == '1') p = (p + q) % m;
  cout << p * q % m;
  return 0;
}
