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);
        int steps = in.nextInt();
        String journey = in.next();
        
        int altitude = 0;
        int valleys = 0;
        int inValley = 0;
        
        if(journey.charAt(0) == 'D')
        {
            inValley = -1;
            altitude--;
        }
        else
        {
            inValley = 1;
            altitude++;
        }
        
        for(int i=1;i<steps;i++)
        {
            char step = journey.charAt(i);
            if(step == 'U')
            {
                if(altitude == 0)
                {
                    inValley = 1;
                }
                altitude++;
            }
            else
            {
                if(altitude == 0)
                {
                    inValley = -1;
                }
                altitude--;
            }
            if(altitude == 0)
            {
                if(inValley == -1)
                {
                    valleys++;
                }
                inValley = 0;
            }
        }
        
        System.out.println(valleys);
    }
}