#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(0);     vector<int> a(5);     string s;     long long q = 0;     for (int i = 1; i < 5; ++i) {       cin >> a[i];     }     cin >> s;     for (int i = 0; i < (int)s.size(); ++i) {       q += a[s[i] -  0 ];     }     cout << q;     return 0;   }   