import java.io.*; import java.util.*; public class Solution { public static void main(String[] args) { Scanner in = new Scanner(System.in); int n = in.nextInt(); char[] ch = in.next().toCharArray(); int level = 0; int vals = 0; for (char c : ch) { if (c == 'U') { if (++level == 0) vals++; } else if (c == 'D') { level--; } } System.out.println(vals); } }