func_code_string: #include <bits/stdc++.h>   using namespace std;   struct __TS {     ~__TS() {       cerr <<  Time elapsed:   << clock() * 1.0 / CLOCKS_PER_SEC << endl;     }   } __ts;   const int mod = 1e9 + 7;   const int maxn = 1239;   long long tp[maxn];   int main() {     tp[0] = 1;     for (int i = (int)(1); i < (int)(maxn); i++) {       tp[i] = (2 * tp[i - 1]) % mod;     }     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     string x;     cin >> x;     int n = x.size();     long long ans = 0;     for (int i = 0; i < (int)(n); i++) {       if (x[i] ==  0 ) continue;       ans += tp[2 * (n - 1 - i) + i];       ans %= mod;     }     cout << ans << endl;     return 0;   }   