#include<bits/stdc++.h> using namespace std; char a[25]; bool t[25]; int n,k,r,s,c,ans; int main() { cin>>n>>k>>r>>s>>c>>a; for(int i=0;i<k;i++){ t[i]=1; if(a[i]=='r') ans+=c; else if(a[i]=='c') ans+=s; else ans+=r; } for(int i=k;i<n;i++){ if(a[i]==a[i-k]&&t[i-k]) continue; t[i]=1; if(a[i]=='r') ans+=c; else if(a[i]=='c') ans+=s; else ans+=r; } cout<<ans; return 0; }