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

public class Solution {

    public static void main(String[] args) {
        int count=0, i, n, valley=0;
    String steps;
    Scanner scan = new Scanner(System.in);
       
   
    do {
        n = scan.nextInt();
    }while (n>=2 && n<=Math.pow(10,6));

    steps = scan.nextLine();
        
    for (i=0; i<steps.length(); i++){
        if(steps.charAt(i) == 'U') {
            count++;
            if (count == 0)
                valley++;
        }
        if(steps.charAt(i) == 'D')
            count--;

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