#include <iostream> #include <sstream> #include <fstream> #include <string> #include <iomanip> #include <vector> #include <deque> #include <queue> #include <stack> #include <set> #include <map> #include <unordered_map> #include <algorithm> #include <functional> #include <utility> #include <bitset> #include <cmath> #include <cassert> #include <cstdlib> #include <ctime> using namespace std; #define rep(i,n) for(int i=0;i<n;i++) #define ll long long int #define f first #define s second #define pi pair<ll, ll> #define pii pair<pi,ll> #define f first #define s second #define pb push_back #define mp make_pair #define pb push_back #define rep(i,n) for(int i=0;i<n;i++) #define fr freopen("source.txt","r",stdin),freopen("output.txt","w",stdout) int main(){ // fr; ll f[26]; rep(i,26){ cin >> f[i]; } string s; cin >> s; ll m=0; rep(i,s.size()){ m=max(m,f[s[i]-'a']); } m*=(ll)s.size(); cout<<m; }