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#include <stdio.h>
#define SIZE 105
int main()
{
	int n, i, g1=0, g2=0, g3=0, g4=0, teams;
	int grp_size[SIZE];
	printf("Enter the number of groups > ");
	scanf("%d", &n);
	printf("Enter the size of each group of the %d groups > ", n);
	for(i=0;i<SIZE;i++)
	{
	scanf("%d", &grp_size[i]);
	}
	for(i=0; i < n; i++)
	{
	switch (grp_size[i])
	{
	case 1:
		g1++;
		break;
	case 2:
		g2++;
		break;
	case 3:
		g3++;
		break;
	case 4:
		g4++;
		break;
	}
	}
	teams=g4;
	if (g3==g1)
	{
	teams+=g1;
	teams+=(g2/2 + g2%2);
	}
	else if (g3>g1)
	{
	teams+=g3;
	teams+=(g2/2 + g2%2);
	}
	else if (g1>g3)
	{
	teams+=g3;
	int temp;
	temp = g1-g3;
	g2+=(g1/2);
	teams+=(g2/2 + g2%2 + g1%2);
	}
	printf("%d", teams);
	return 0;
}