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 in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String inputs = in.nextLine();
        int move = 0;
        int valleys = 0;   
        char c = 'a';
        for(int i = 0; i < n; i++) {
            c = inputs.charAt(i);
            switch(c) {
                case 'U':
                    move++;
                    break;
                case 'D':
                    move--;
                    break;
                default:
                    break;
            }
            if(move == -1 && inputs.charAt(i + 1) == 'U') {
                valleys++;
            }
        }
        System.out.println(valleys);
    }
}