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 l=scan.nextInt();
        scan.nextLine();
        String s=scan.nextLine();
        int count=0;
        int counter=0;
        for(int i=0;i<l;i++)
        {
        	if(s.charAt(i)=='U')
        	{
        		counter++;
        	/*	if(counter==0)
        		{
        			count++;
                   
        		}*/
             
        	}
        	if(s.charAt(i)=='D')
        	{
        		counter--;
        		if(count>=0&&counter==-1)
        		{
        			count++;
                    
                }
        	}
        }
        System.out.println(count);
        
    }
}