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

int main()
{
    int n;
    cin >> n;

    int a,b,c,d,flag[10] = {};
    string r;
    for(int i = 0; i < n; i++){
        cin >> a >> b >> c >> d >> r;
        if(r == "YES"){
            flag[a]++;
            flag[b]++;
            flag[c]++;
            flag[d]++;
        }else{
            flag[a]--;
            flag[b]--;
            flag[c]--;
            flag[d]--;
        }
    }


    int ans = -1;
    for(int i = 0; i <= 9; i++){
        if(ans < flag[i]) ans = i;
    }
    cout << ans <<endl;
    return 0;
}