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 input = new Scanner(System.in);
        int n =input.nextInt();
        char[] sequence = new char[n];
        String stuff = input.next();
        int elevation = 0;
        int numberOfValleys = 0;
        boolean atZero = false;
        for(int k = 0; k < n; k++)
            sequence[k] = stuff.charAt(k);
        for(int i = 0; i < n; i++){
            if(elevation == 0 && sequence[i] == 'D')
                numberOfValleys++;
            if(sequence[i] == 'U')
                elevation++;
            else if(sequence[i] == 'D')
                elevation = elevation - 1;
        }
        System.out.println(numberOfValleys);
    }
}