#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma comment(linker, "/stack:200000000")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

using namespace std;
using namespace __gnu_pbds;

typedef long long ll;
typedef string str;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector <pii> vpii;
typedef vector <pll> vpll;
typedef map <str,int> mapsi;
typedef map <str,int> :: iterator mapsitr;
typedef map <int , int> mint;
typedef map <ll , ll> mll;
typedef set <int> si;
typedef set <ll> sll;
typedef si :: iterator sitr;
typedef si :: reverse_iterator rsitr;
typedef sll :: iterator sltr;
typedef sll :: reverse_iterator rsltr;
#define mset multiset

typedef mset <int> msi;
typedef mset <ll> msll;
typedef msi :: iterator msitr;
typedef msi :: reverse_iterator msritr;
typedef msll :: iterator msltr;
typedef msll :: reverse_iterator mslritr;

#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
#define mp make_pair
#define pb push_back
#define pob pop_back
#define pf push_front
#define pof pop_front
#define fi first
#define se second
#define fs first.second
#define ss second.second
#define ff first.first
#define sf second.first
#define newl '\n'
#define fbo find_by_order
#define ook order_of_key

char to_upper (char x){
    if( 97 <= int(x) && int(x) <= 122)return char(x-32);
    else if( 65 <= int(x) && int(x) <= 90)return x;
}
char to_lower (char x){
    if( 97 <= int(x) && int(x) <= 122)return x;
    else if( 65 <= int(x) && int(x) <= 90)return char(x+32);
}
int numerize (char x){
    if(48 <= int(x) && int(x) <= 57)return int(x-'0');
    else if( 97 <= int(x) && int(x) <= 122)return int(x-96);
    else if( 65 <= int(x) && int(x) <= 90)return int(x-64);
}
bool isect (int l1, int r1, int l2, int r2){
    pii p1,p2;
    p1 = mp(l1,r1); p2 = mp(l2,r2);
    if(p1>p2)swap(p1,p2);
    if(p2.fi <= p1.se)return true;
    else return false;
}
ll quickpow (ll num1, ll num2, ll MOD){
    if(num2==0)return 1;
    else if(num2==1)return num1;
    else{
        ll temp = quickpow (num1,num2/2,MOD); ll res = ((temp%MOD) * (temp%MOD))%MOD;
        if(num2%2==1) res = ((res%MOD)*(num1%MOD))%MOD; return res;
    }
}
ll invmod (ll num, ll MOD){return quickpow (num,MOD-2,MOD);}
ll gcd (ll num1, ll num2){
    if(num1 < num2) swap(num1,num2); ll num3 = num1 % num2 ;
    while(num3 > 0){ num1 = num2; num2 = num3; num3 = num1 % num2;}
    return num2;
}
ll lcm (ll num1 , ll num2){return (ll) (num1/__gcd(num1,num2))*num2;}
// end of Template
int n,k;
ll r,s,p;
str t;
ll ans;
vector<str> v;
ll dp[100010][5];
ll value(str z){
    dp[0][1] = 0;
    dp[0][2] = 0;
    dp[0][3] = 0;
    if(z[0] == 'r'){dp[0][1] = r;}
    if(z[0] == 's'){dp[0][2] = s;}
    if(z[0] == 'p'){dp[0][3] = p;}
    for(int i=1;i<z.size();i++){
        dp[i][1] = 0;
        dp[i][2] = 0;
        dp[i][3] = 0;
        if(z[i] == 'r') dp[i][1] = r;
        else if(z[i] == 's') dp[i][2] = s;
        else if(z[i] == 'p') dp[i][3] = p;
        dp[i][1] += max(dp[i-1][2] , dp[i-1][3]);
        dp[i][2] += max(dp[i-1][1] , dp[i-1][3]);
        dp[i][3] += max(dp[i-1][1] , dp[i-1][2]);
    }
    ll res = 0;
    for(int i=1;i<=3;i++) res = max(res , dp[z.size()-1][i]);
    return res;
}
int main(){

//    freopen("input.txt", "r", stdin);
//    freopen("output.txt", "w", stdout);

    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    cin>>n>>k;
    cin>>r>>s>>p;
    cin>>t;
    for(int i=0;i<t.size();i++){
        if(t[i] == 'r') t[i] = 'p';
        else if(t[i] == 's') t[i] = 'r';
        else if(t[i] == 'p') t[i] = 's';
    }
    for(int i=0;i<k;i++){
        str temp = "";
        for(int j=i;j<t.size();j+=k){
            temp += t[j];
        }
        v.pb(temp);
    }
    for(int i=0;i<v.size();i++){
        ans += value(v[i]);
    }
    cout<<ans<<newl;
}


Measured memory_bytes: 5188