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 size = scanner.nextInt();
		scanner.nextLine();
		char[] characters = scanner.nextLine().toCharArray();
		scanner.close();

		int numberOfValleys = 0;
		
		int level = 0;
		for (int i = 0; i < size; i++) {
			boolean temp = false;
			
			if(level < 0)
				temp = true;
			
			if(characters[i] == 'U')
				level++;
			else
				level--;
			
			if(temp && level == 0)
				numberOfValleys++;
			
			
		}
		System.out.println(numberOfValleys);
        
    }
}