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 first = scan.nextInt();
		scan.nextLine();
		String second = scan.nextLine();
		char[] array = second.toCharArray();

		int valley = 0, value = 0;
		boolean flag = false;
		for (int i = 0; i < array.length; i++) {
			if (array[i] == 'D') {
				 flag = true;
				 value++;
			}else if (array[i] == 'U'){
				value--;
				if (value == 0 && flag){
					valley++;
					flag = false;
				}
					
			}
		}
		
		System.out.println(valley);		
		
	}
}