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 scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        scanner.useDelimiter("");
        scanner.next();
        int h = 0;
        int valleys = 0;
        int prev;
        for (int i = 0; i < n; ++i) {
            prev = h;
            if (scanner.next().charAt(0) == 'U') {
                if (prev == -1) {
                    ++valleys;
                }
                ++h;
            } else {
                --h;
            }
        }
        scanner.close();
        System.out.println(valleys);
    }
}