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 size=in.nextInt(); String hike=in.next(); int height=0; int valleys=0; for(int i=0;i<size;i++){ if(hike.charAt(i)=='D'){ if(height==0){ valleys++; } height--; } else{ height++; } } System.out.println(valleys); } }