import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;
import java.util.Collections;
import java.util.ArrayList;

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int h[] = new int[26];
        int breadth;
        ArrayList<Integer> ar = new ArrayList<Integer>();
        for(int i=0; i < 26; i++){
            h[i] = in.nextInt();
        }
        String word = in.next();
        int len = word.length();
        for(int j=0; j<len; j++)
        {
          if(word.charAt(j)=='b' || word.charAt(j)=='d' || word.charAt(j)=='h'){
              breadth = 3;
              ar.add(breadth);
          } 
           else if(word.charAt(j)=='f'){
               breadth = 4;
               ar.add(breadth);
           }
            else if(word.charAt(j)=='i'){
                breadth = 2;
                ar.add(breadth);
            }
            else if(word.charAt(j)=='a' || word.charAt(j)=='c' || word.charAt(j)=='e' || word.charAt(j)=='i'){
                 breadth = 1;
                ar.add(breadth);
            }
            else {breadth = 5;
                  ar.add(breadth);
                 }
        }
        int max = ar.get(0);
       for(int l = 0; l < ar.size(); l++) {
              int number = ar.get(l);
              if(number > max) max = number;
            }
        System.out.println(len*max);
        
    }
}