import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) throws Exception {
        Scanner scanner = new Scanner(System.in);
        int numSteps = scanner.nextInt();
        String steps = scanner.next();
        int elevation = 0;
        boolean inValley = false;
        int numValleys = 0;
        for (int i = 0; i < numSteps; i++) {
            if (steps.charAt(i) == 'U') {
                // Detect if we are exiting a valley
                if (elevation == -1) {
                    inValley = false;
                    numValleys++;
                }
               
                elevation++;
            } else if (steps.charAt(i) == 'D') {
                // Detect if we are entering a valley
                if (elevation == 0) {
                    inValley = true;
                }
                
                elevation--;
            } else {
                throw new Exception("Unknown step direction.  Only allowed 'U' for up and 'D' for down.  Got \"" + steps + "\"");
            }
        }
        System.out.println(numValleys);
    }
}