import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

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 sc = new Scanner(System.in);
        String strSteps = sc.nextLine();
        int steps = Integer.parseInt(strSteps);
        String hike = sc.nextLine();
        if (hike.length() < 3){
            System.out.println(0);
            return;
        }
        int cntr = 0;
        int lvl = 0;
        int lastLvl = 0;
        for (int i = 0; i < hike.length(); i++){
            if(hike.charAt(i) == 'U') {
                lvl++;
                if (lastLvl < 0 && lvl == 0) cntr++;
            }
            else if(hike.charAt(i) == 'D') lvl--;
            lastLvl = lvl;
        }
        System.out.println(cntr);
    }
}