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 sc = new Scanner (System.in); int n = sc.nextInt(); String s = sc.next(); int curL = 0; int valCount = 0; for(int i=0; i<n; i++){ char tmp = s.charAt(i); if(tmp == 'U'){ curL++; }else{ if(curL==0){ valCount++; } curL--; } } System.out.println(valCount); } }