#include<bits/stdc++.h>

using namespace std;

#define Rabbir_Reaper ios_base::sync_with_stdio(0); cin.tie(0);

int main(){

    Rabbir_Reaper

    int n,k;

    cin>>n>>k;

    queue<int> dis;

    for(int i=0;i<n;i++){

        string temp;

        char sex;

        int age;

        cin>>temp;

        stringstream ss(temp);

        ss>>sex;

        ss>>age;

        if(age >= 65 || age <= 12){

            dis.push(i);

        }else if(sex == 'F' && age >= 35 && age <= 45){

            dis.push(i);

        }

    }

    long long ans=0;

    for(int i=0;i<k;i++){

        ans += (long long)(dis.front()-i);

        dis.pop();

    }

    cout<<ans;

}