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

public class Solution {

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        scanner.nextLine();
        
        String path = scanner.nextLine();

        int valleys = 0;
        int prevHeight = 0;
        int height = 0;
        
        if (path.length() == 0) {
            System.out.println(valleys);
            return;
        }
        
        if (path.charAt(0) == 'U') {
            height = 1;
        } else {
            height = -1;
        }
        prevHeight = height;
        
        for (int i=1; i<n; i++) {
            if (path.charAt(i) == 'U') {
                height++;
            } else {
                height--;
            }
            
            if (prevHeight < 0 && height == 0) {
                valleys++;
            }
            
            prevHeight = height;
        }
        
        System.out.println(valleys);
    }
}