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 in = new Scanner(System.in);
        int n = in.nextInt();
        String kata = in.next();
        String height[] = new String[n];
        
        kata = kata.substring(0, n);
        height = kata.split("");
        
        int laut = 0;
        int temp = 0;
        int hasilSementara = 0;
        for(int height_i=1; height_i < n+1; height_i++){
        	if(height[height_i].equals("U")){
        		temp = hasilSementara;
        		hasilSementara++;
        		if(hasilSementara == 0 && temp < 0){
        			laut++;
        		}
        	}
        	
        	if(height[height_i].equals("D")){
        		hasilSementara--;
        	}
        }
        System.out.println(laut);
	}
}