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 scan = new Scanner(System.in);
        int numSteps = Integer.parseInt(scan.nextLine());
    	String steps = scan.nextLine();
    	int numValleys = 0;
    	int level = 0;
    	boolean inValley = false;
    	for (int i = 0; i < numSteps; i++)	{
    		if (steps.charAt(i) == 'U')	{
    			level += 1;
    		}
    		else level -= 1;
    		if (level < 0 && !inValley)	{
    			inValley = true;
    		}
    		if (level == 0 && inValley)	{
    			inValley = false;
    			numValleys += 1;
    		}
    	}
    	System.out.println(numValleys);
    }
}