import string
s=input()
k=int(input())
a=list(map(int, input().split()))
b=0
for i in range(len(s)):
p=string.ascii_lowercase.index(s[i])
b=b+a[p]*(i+1)
if k==0:
print(b)
else:
m=max(a)
c=list(range(len(s)+1,len(s)+k+1))
c1=[i * m for i in c]
b=b+sum(c1)
print(b)#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> ii;
vector<int> v;
int main() {
string s;
int k, elm;
cin >> s;
cin >> k;
for (int i = 0; i < 26; ++i) {
cin >> elm;
v.push_back(elm);
}
int mx = *max_element(v.begin(), v.end());
ll res = 0;
for (int i = 0; i < s.length(); ++i) {
res = res + v[s[i] - 'a'] * (i + 1);
}
int j = s.length() + 1;
while (k--) {
res = res + j * mx;
++j;
}
cout << res;
return 0;
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