#include <iostream>
#define rep(i, l, n) for (int i = (l); i < (n); i++)
using namespace std;


int main(void) {
	int a1, a2, a3, b;	cin >> a1 >> a2 >> a3 >> b;
	int a[3] = { a1,a2,a3 };

	int ans = 0;
	rep(i, 0, 3) {
		rep(j, 0, 3) {
			rep(k, 0, 3) {
				int damage = a[i] + a[j] + a[k];
				if (i == 0 and j == 1 and k == 2) {
					damage += b;
				}
				ans = max(ans, damage);
			}
		}
	}
	cout << ans << endl;

	return 0;
}