#include<bits/stdc++.h> using namespace std; int main() { int n,k,r,s,c,sum=0; char a[25]; cin>>n>>k>>r>>s>>c; for(int i=0;i<n;i++){ cin>>a[i]; } int num1=1,num2=1,num3=1; for(int i=1;i<=n;i++){ if(a[i]==a[i-k]&&a[i]=='r'){ num1++; } if(a[i]==a[i-k]&&a[i]=='s'){ num2++; } if(a[i]==a[i-k]&&a[i]=='c'){ num3++; } else if(a[i]=='r') sum+=c; else if(a[i]=='s') sum+=r; else if(a[i]=='c') sum+=s; } cout<<sum; return 0; }