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) throws IOException {
        Scanner sc = new Scanner(System.in);
        int n = Integer.valueOf(sc.nextLine());
        String st = sc.nextLine();
        int height = 0;
        int res=0;
        for(int i = 0; i<st.length(); i++) 
        {
            char c = st.charAt(i);
            switch(c) {
                case 'U':
                    height++;                   
                    if(height==0) {
                        res++;
                    }
                break;
                case 'D':
                    height--;
                break;
            default:
            break;
            }
        }
        System.out.println(res);
    }
    
}