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 scan = new Scanner(System.in);
        int N = scan.nextInt();
        scan.nextLine();
        String S = scan.nextLine();
        int count = 0;
        int val = 0;
        char[] arr = new char[S.length()];
        arr = S.toCharArray();
        for(int i=0; i<S.length();i++)
            {
            if(arr[i]=='D')
                val--;
            else if(arr[i]=='U')
                {
                val++;
                if(val==0)
                    count++;
            }
                
         
        }
          System.out.println(count);
    }
}