#include<bits/stdc++.h>
using namespace std;

#define F first
#define S second
#define pb push_back
#define ll long long

vector < pair < int,pair <string,int> > > a;
int ans = 0;
int mildred = 7, elsie = 7, bessie =7;

int main() {

    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
    int n;
    cin >> n;
    int d, k;
    string nn;
    for(int i = 0 ; i < n; i++) {
        cin >> d >> nn >> k;
        a.pb({d,{nn,k}});
    }
    set <int> s;
    s.insert(1);
    s.insert(2);
    s.insert(3);
    sort(a.begin(),a.end());
    for(int i = 0 ; i < n; i++) {
        ll mx = -1e14;
        if(a[i].S.F=="Mildred")mildred+=a[i].S.S;
        if(a[i].S.F=="Bessie")bessie+=a[i].S.S;
        if(a[i].S.F=="Elsie")elsie+=a[i].S.S;
        mx=max(mildred, max(elsie, bessie));
        set<int> ss;
        if(elsie==mx) ss.insert(3);
        if(bessie==mx) ss.insert(2);
        if(mildred==mx) ss.insert(1);
        if(s!=ss) {
            ans++;
            s=ss;
        }
    }
    cout << ans;
}