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 in = new Scanner(System.in);
        String t = in.nextLine();
        String s = in.nextLine();    
        char [] ch = s.toCharArray();
        int l = 0;
        int v = 0;
        for(int i=0 ;i < ch.length; i++){
            if(ch[i] == 'U'){
                l++;
                if(l == 0)
                    v++;
            }          
          
            if(ch[i] == 'D'){
                l--;
            }
        }
        System.out.println(v);
        }
    }