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

public class Solution {

    public static void main(String[] args) {
        
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String str = in.nextLine();
        char[] steps = str.toCharArray();
        boolean seaLevel = true;
        int stepDefiner = 0, counter = 0;
        
        for (int i = 0; i < steps.length; i++) {
            if (steps[i] == 'U') {
                stepDefiner++;
            } else {
                stepDefiner--;
            }
            
            if (stepDefiner == 0) {
                seaLevel = true;
            } else {
                seaLevel = false;
            }
            
            if (seaLevel) {
                if (steps[i] == 'U') {
                    counter++;
                }
            }
        }
        
        System.out.println(counter);
    }
}