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

public class Solution {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int valleyCount = 0;
        int currentHeight = 0;
        boolean inValley = false;
        
        input.nextLine();
        for (char step : input.next().toCharArray()) {
            currentHeight += step == 'U' ? 1 : -1;
            
            if (currentHeight < 0 && inValley == false) {
                valleyCount++;
                inValley = true;
            }
            if (inValley && currentHeight == 0) {
                inValley = false;
            }
        }
        
        System.out.println(valleyCount);
    }
}