//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);
    }