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 sc = new Scanner(System.in);
       int i = sc.nextInt();
       String str = sc.next();
       char[] ch = str.toCharArray();
        int l = ch.length;
        int c=0,flag=0;;
       for(int j=0;j<l;j++){
           if(ch[j]=='U'){
               c++;
           }
           else if(ch[j]=='D'){c--;}
           if(c==0){
               if(ch[j]=='U')
                   flag+=1;
           }
       }
        System.out.print(flag);
        
        
        
    }
}