import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

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 sc = new Scanner(System.in);
        int stepCount = sc.nextInt();
        sc.nextLine();
        String steps = sc.nextLine();
        int valleys = 0;
        int height = 0;
        boolean valleyStart = false;
        
        int previousHeight = 0;
        for (int i = 0; i < stepCount; i++) {
            if (steps.charAt(i) == 'U') {
                height++;
                if (height == 0 && valleyStart) {
                    valleys++;
                    valleyStart = false;
                }
            } else {
                if (previousHeight == 0) {
                    valleyStart = true;
                }
                height--;
            }
            
            previousHeight = height;
        }
        
        System.out.println(valleys);
    }
}