#include <bits/stdc++.h>   using namespace std;   int arr[4], sum;   string s;   int main() {     cin >> arr[0] >> arr[1] >> arr[2] >> arr[3] >> s;     for (int i = 0; i < s.size(); i++) {       sum += arr[s[i] - 49];     }     cout << sum;   }   