import java.util.*;
import java.io.*;
public class milkmeasure {
	static class cow{
		String name;
		int milk;
		int day;
		int difference;
	}
	// each input contains this
	static class comp implements Comparator <cow>{
		public int compare(cow c1, cow c2) {
			if(c1.day < c2.day) {
				return -1;
			}
			else {
				return 1;
			}
		}
	}
	//sort by days in incremeneting order
	public static void main(String[] args) throws IOException{
		Scanner scan = new Scanner(new File("measurement.in"));
		PrintWriter fout = new PrintWriter(new File("measurement.out"));
		int n = scan.nextInt();
		int counter = 0;
		cow arr[] = new cow[n];
		for(int i = 0; i < n; i++) {
			arr[i] = new cow();
			arr[i].day = scan.nextInt();
			arr[i].name = scan.next();
			arr[i].difference = scan.nextInt();
		}
		//input
		Arrays.sort(arr, new comp());
		//sort cows by days added
		cow names[] = new cow[3];
		for(int i= 0 ;i < 3; i++) {
			names[i] = new cow();
			names[i].milk = 0;
		}
		names[0].name = "Bessie";
		names[1].name = "Mildred";
		names[2].name = "Elsie";
		// I use the cow class to just make it for Bessie, Mildred, and Elsie.
		// This way, we can store it easily
		String previousWinner = "";
		for(int i = 0; i < n; i++) {
			String winner = "";
			if(arr[i].name.equals("Bessie")) {
				names[0].milk += arr[i].difference;
			}
			// add all everything from input into each cows' profile
			else if(arr[i].name.equals("Mildred")){
				names[1].milk += arr[i].difference;
			}
			else {
				names[2].milk += arr[i].difference;
			}
			Arrays.sort(names, new comp());
			if(names[0].milk > names[1].milk && names[0].milk > names[2].milk) {
				winner = "Bessie";
				// Bessie wins
			}
			else if(names[1].milk > names[0].milk && names[1].milk > names[2].milk) {
				winner = "Mildred";
				//Mildred wins
			}
			else if(names[2].milk > names[0].milk && names[2].milk > names[1].milk) {
				winner = "Elsie";
				//Elsie wins
			}
			else if(names[0].milk == names[1].milk && names[0].milk > names[2].milk) {
				winner = "Bessie Mildred";
				//Bessie and Mildred tied for win
			}
			else if(names[0].milk == names[2].milk && names[0].milk > names[1].milk) {
				winner = "Bessie Elsie";
				//Bessie and Elsie are tied for win
			}
			else if(names[1].milk == names[2].milk && names[2].milk > names[0].milk) {
				winner = "Mildred Elsie";
				//Mildred and Elsie are tied for win
			}
			else {
				winner = "Bessie Mildred Elsie";
				// they are all tied for the win
			}
			if(!winner.equals(previousWinner)) {
				counter++;
				// if the previous winner isn't equal to the winner, the scoreboard changes
			}
			previousWinner = winner;
			//replace previousWinner with the winner;
		}
		fout.println(counter);
		//output.
		fout.close();
	}
}