// OBI2023
// Tarefa Corrida
// r. anido

import java.util.Scanner;

public class corrida {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);

		int n = in.nextInt();

		int xmax = 0, xmin = 0;
		int ymax = 0, ymin = 0;
		int x = 0, y = 0;
		
		for (int i=0; i<n; i++) {
		    int c = in.nextInt();
		    String d = in.next();
		    
		    if (d.equals("N")) { 
			y = y + c;
			if (y > ymax)
			    ymax = y;
		    }
		    else if (d.equals("S")) {
			y = y - c;
			if (y < ymin)
			    ymin = y;
		    }
		    else if (d.equals("L")) {
			x = x + c;
			if (x > xmax)
			    xmax = x;
		    }
		    else {
			x = x - c;
			if (x < xmin)
			    xmin = x;
		    }
		}
		
		int largura = xmax - xmin;
		int altura = ymax - ymin;
		int comprimento = 2*(largura + 2) + 2*(altura + 2);
		    
		System.out.println(comprimento);
		
	}
}