//89%，不知道哪里有坑。。。 public static void main(String args[]){ Scanner cin = new Scanner(System.in); int n = cin.nextInt(); int[] array = new int[n]; int a = 0,b = 0,result = 0; for(int i = 0 ; i < n ; ++i){ array[i] = cin.nextInt(); if(array[i] == 1) a++; else if(array[i] == 2) b++; } for(int i = 0 ; i < a ; ++i){ if(array[i] != 1) result++; } for(int i = a ; i < a + b ; ++i){ if(array[i] == 3) result++; } System.out.println(result); }