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) {
        Scanner scan = new Scanner(System.in);
        int steps = scan.nextInt();
        scan.nextLine();
        String hike = scan.nextLine();
        
        int seaLevel = 0;
        boolean under = false;
        int valley = 0;
        for(int i = 0; i < steps ; i++)
        {
            if(hike.charAt(i) == 'U')
            {
                seaLevel++;
            }else if(hike.charAt(i) == 'D')
            {
                seaLevel--;
            }
            
            if(seaLevel > 0)
            {
                under = false;
            }else if(seaLevel < 0)
            {
                under = true;
            }else
            {
                if(under)
                {
                    valley++;
                }
            }
        }
        System.out.println(valley);
    }
}