#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <queue>
#include <stack>
#include <string>
#include <bitset>
#include <cstdio>
#include <limits>
#include <vector>
#include <climits>
#include <cstring>
#include <cstdlib>
#include <fstream>
#include <numeric>
#include <sstream>
#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;


int main(){
    int h[26];
    int i,j,temp,k,sum;
    for(i=0;i<26;i++)
        {
        cin>>h[i];
    }
    
    
    string word;
    cin >> word;
    
    char ascii=word[0];
    k=(int)ascii;
    
    
    temp=97-k;
    
    
    int ma=max(max(h[temp],h[temp+1]),h[temp+2]);
    
   
    
    cout<<ma*3;
    
    return 0;
}