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 in = new Scanner(System.in);
        int n = in.nextInt();
        in.nextLine();
        String steps = in.nextLine();
        int level = 0;
        int valleys = 0;
        for(int i = 0; i < n; i++){
            if(steps.charAt(i) == 'D' && level == 0){
                valleys++;
                level--;
            }
            else if(steps.charAt(i) == 'D'){
                level--;
            }
            else if(steps.charAt(i) == 'U'){
                level++;
            }
        }
        System.out.println(valleys);
    }
}