#include <bits/stdc++.h>
using namespace std;
using namespace std;
const long long mod = 1e9 + 7;
const int inf = 1e9;
string s;
long long expMod(long long base, long long ex, long long mod) {
  if (ex == 0) return 1;
  long long temp = expMod(base, ex / 2, mod);
  temp = (temp * temp) % mod;
  if (ex % 2) temp = (temp * base) % mod;
  return temp;
}
long long solve(string x) {
  long long n = x.size();
  if (n == 1) {
    if (x[0] == '1')
      return 1;
    else
      return 0;
  }
  string temp = x.substr(1);
  long long sz = temp.size();
  long long ret = 0;
  if (x[0] == '0') {
    ret = (1LL * 2 * solve(temp)) % mod;
  } else {
    ret = (expMod(2, 2 * sz, mod) + 2 * solve(temp)) % mod;
  }
  return ret;
}
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> s;
  cout << solve(s) << "\n";
  return 0;
}
