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

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        String arr = scan.next();
        
        int total = 0;
        int counter = 0;
        boolean isValley = true;
        String sub = "";

        for(int i = 0; i < arr.length(); i++){
            sub = arr.substring(i, i + 1);
            if(sub.equals("D")){
                total--;
            }
            if(sub.equals("U")){
                total++;
                if(total == 0){
                    counter++;
                }
            }
        }
        System.out.println(counter);
    }
}