#include <iostream>
using namespace std;
int main()
{
    int range, n1, n2, n3, totalrotation = 0;
    cin >> range >> n1 >> n2 >> n3;
    totalrotation += (2*range + n1) + (n1+(range-n2)) + (range - n2 + n3);
    cout << totalrotation << endl;
    return 0;
}