#include<stdio.h>
int main()
{
	int a[3], b;
	scanf("%d %d %d %d", &a[0], &a[1], &a[2], &b);
	int ans = a[0] + a[1] + a[2] + b;
	if (ans < 3 * a[2])
		ans = 3 * a[2];
	printf("%d\n", ans);
	return 0;
}