include <bits/stdc++.h>

using namespace std; int main() { string s; cin>>s; int p = s.size(); int n;cin>>n; int energy[30]; for(int i = 0;i<26;++i)cin>>energy[i]; long long r = 0; long long ans = 0; for(int i = 1;i<=n;++i){ r+=i; ans+=energy[s[r%p]-65]; } cout<<ans; return 0; }