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();
        String s = in.next();
        int numValleys = 0;
        int level = 0;
        for (int i = 0; i < n; i++) {
            if (s.charAt(i) == 'D' && level == 0) {
                numValleys++;
            }
            
            if (s.charAt(i) == 'D') {
                level--;
            }
            if (s.charAt(i) == 'U') {
                level++;
            }
            
        }
        
        /* int i = 0;
        while (i < n) {
            if (s.charAt(i) == 'D') {
                while (s.charAt(i) == 'D') {
                    i++;
                }
                numValleys++;
            }
            i++;
        } */
        System.out.println(numValleys); 
    }
}