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

public class Solution 
{
    static int level = 0;
    static String chart;
    static boolean ift;
    static int numval = 0;
    static int numLength;
    public static void main(String[] args) 
    {
        Scanner scanner = new Scanner(System.in);
        numLength = Integer.parseInt(scanner.nextLine());
        chart = scanner.nextLine();
        char dir;
        for(int i = 0; i < numLength; i++)
        {
            dir = chart.charAt(i);
            if(dir == 'D')
                level--;
            else
                level++;
            if(dir == 'D' && level == -1)
            {
                ift = true;
            }
            if(dir == 'U' && level == 0 && ift == true)
            {
                 numval++;
            }
        }
        System.out.println(numval);
    }
}