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 scanner = new Scanner(System.in);
        
        int n = scanner.nextInt();
        int level = 0;
        
        int numValley = 0;
        
        String input = scanner.next();
        
        for (int i = 0; i < n; i++)
            {
            char move = input.charAt(i);
            
            if (move == 'U')
            {
                if (level == -1) numValley++;
                level++;
            }
            else if (move == 'D')
                {
                level--;
            }
        }
        System.out.println(numValley);
    }
}