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 sc = new Scanner(System.in);
        int n = sc.nextInt();
        String v = sc.next();

        int[] degrees = new int[n + 1];
        degrees[0] = 0;
        for (int i = 1; i <= n; i++) {
            if (v.charAt(i - 1) == 'U')
                degrees[i] = degrees[i - 1] + 1;
            else
                degrees[i] = degrees[i - 1] - 1;
        }

        int count = 0;
        for (int j = 1; j <=n; j++) {
            if (degrees[j - 1] < 0 && degrees[j] >= 0)
                count++;
        }

        System.out.println(count);
        sc.close();
    }
}