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 scan = new Scanner(System.in); int n = scan.nextInt(); String walk = scan.next(); int count = 0; int vallies = 0; for(int i=0; i<n; i++) { char temp = walk.charAt(i); String move = Character.toString(temp); if(move.equals("D") && count == 0) { count--; vallies++; continue; } else if(move.equals("D")){ count--; continue; } else { count++; continue; } } System.out.println(vallies); } }