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

public class Solution {

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

        int testCase = sc.nextInt();
        String[] steps = sc.next().split("");

//        ArrayList<String> al=new ArrayList<String>();
//
//        for (int i = 0; i < testCase; i++) {
//            al.add(sc.next());
//        }

        int seaLevel = 0;
        int previousSeaLevel = 0;
        int valley = 0;
        int size = steps.length;

        for (int i = 0; i < size; i++) {

            String s = steps[i];
            if (s.equalsIgnoreCase("U")) {
                seaLevel++;
                //System.out.println("sea level U :"+seaLevel);
            } else {
                seaLevel--;
                //System.out.println("sea level D :"+seaLevel);

            }

            if (seaLevel == 0 && previousSeaLevel <= 0) {
                valley++;
            }

            previousSeaLevel = seaLevel;
        }


            System.out.println(valley);



    }
}