#include <bits/stdc++.h>

using namespace std;

int main(){
    int n, p1, p2;
    double s = 0, s1, s2;
    cin >> n >> p1 >> p2 >> s1 >> s2;
    int nm = 0, ns = 0;
    string t;
    for(int i = 0; i < n; i++){
        cin /*>> t >> t */>> t;
        if(t=="SMS"){
            ns++;
        }
        else{
            nm += (t[0]-'0')*600 + (t[1]-'0')*60 + (t[3]-'0')*10 + (t[4]-'0');
        }
    }
    if(nm/60.0 > p1){s += (nm/60.0-p1)*s1;}
    if(ns > p2){s += (ns-p2)*s2;}
    cout << s << endl;
    return 0;
}
