import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        String cadena = in.next();
        char[] charArray = cadena.toCharArray();
        boolean nivelMar = true;
        int subidas = 0;
        int bajadas = 0;
        int valles = 0;
        
         for (char i: charArray) {
            
            if(nivelMar && i == 'D'){
                valles++;
            }
            if(i=='D'){
                subidas--;
                bajadas++;
            }else{
                subidas++;
                bajadas--;
            }
            
            if(subidas ==0 && bajadas==0)
                nivelMar = true;
            else
                nivelMar=false;
            

        }
         
        System.out.println(valles);
    }
}