#include <bits/stdc++.h>
using namespace std;
long long gcd(long long a, long long b) {
  if (b == 0) return a;
  if (a < b) return gcd(b, a);
  while (a > b) {
    a %= b;
  }
  return gcd(b, a);
}
long long lcm(long long a, long long b) { return a * (b / gcd(a, b)); }
const double EPS = 10e-9;
const double PI = acos(-1.0);
const double INF = (1LL << 29);
using namespace std;
template <typename T>
string toString(T t) {
  stringstream ss;
  ss << t;
  return ss.str();
}
const long long prime = 1000000007;
long long power(long long n, long long a, long long prime) {
  long long res = 1LL;
  while (a > 0) {
    if (a & 1LL) {
      res *= n;
      res %= prime;
    }
    n *= n;
    n %= prime;
    a >>= 1;
  }
  return res;
}
int main() {
  string x;
  cin >> x;
  long long total = 0;
  for (int i = 0; i < (x.size()); ++i) {
    if (x[i] == '1') {
      int len = i, left = x.size() - len - 1;
      long long part = power(2, len, prime) * power(4, left, prime);
      total += part % prime;
      total %= prime;
    }
  }
  cout << total << endl;
  return 0;
}
