import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static int val(char c)
        {
            if(c == 'U')
                return 1;
        else
            return -1;
    }
    public static void main(String[] args) throws Exception
    {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        
        String path = br.readLine();
        
        boolean start=false; boolean end = false; int count = 0; int tour = 0;
        
        for(int i=0;i<N;i++)
            {
                tour += val(path.charAt(i));
                if(tour == -1 )
                    start = true;
            
                if(start && tour == 0)
                    {
                        //end = true;
                        count++;
                        start=false;
                    }
                
            }
        System.out.print(count);
        
    }
}