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

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 stdIn = new Scanner(System.in);
        int seaLevel = 0, numOfSteps = 0, i = 0, count = 0;
        int[] seaLevels = null; //Bug. If seaLevels is removed, no response from STDOUT.
        String steps = null;
        boolean outOfRange = false, potentialValley = false;
        if (stdIn.hasNextInt()) {
            numOfSteps = stdIn.nextInt();
            if (numOfSteps >= 2 && numOfSteps <= Math.pow(10.0, 6.0)) {
                seaLevels = new int[numOfSteps];
                if (stdIn.hasNext()) {
                    steps = stdIn.next();
                    while (i < steps.length()) {
                        switch (steps.charAt(i)) {
                            case 'U':   {
                                seaLevel++; 
                                seaLevels[i++] = seaLevel;
                                if (seaLevel == 0 && potentialValley) {
                                    count++;
                                    potentialValley = false;
                                }
                                break;
                            }
                            case 'D':   {   
                                seaLevel--; 
                                potentialValley = true;
                                seaLevels[i++] = seaLevel; 
                                break; 
                            }
                        }
                    }
                    System.out.println(count);

                }
            } else
                outOfRange = true;
        }
    }
}