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 input = new Scanner(System.in);
        int steps = input.nextInt();
        input.nextLine();
        String n = input.nextLine();
        int tracker = 0;
        int prevtracker = 0;
        int valleys = 0;
        for(int i = 0; i < steps; i++){
            prevtracker = tracker;
            if(n.charAt(i) == 'D'){
                tracker--;
            } else if(n.charAt(i) == 'U'){
                tracker++;
            }
            if(tracker == 0 && prevtracker == -1){
                valleys++;
            }   
        }
        System.out.println(valleys);
    }
}