#include <iostream>
#include<algorithm>
using namespace std;

int main()
{
    int n,a,b,sum=0;
    string s,s1;
    cin>>n>>a>>b;
    for(int i=1;i<=n;i++){
        cin>>s>>s1;
        if(s1[0]=='/'&&s1.find("/oh")!=string::npos){
            cout<<s1.find("/oh");
            sum+=a;
        }
        else if(s1[0]=='/'&&s1.find("/hsh")!=string::npos){
            sum+=b;
        }
    }
    cout<<sum;
    return 0;
}