#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;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwppbnQgbWFpbigpCnsKICAgIGludCByYW5nZSwgbjEsIG4yLCBuMywgdG90YWxyb3RhdGlvbiA9IDA7CiAgICBjaW4gPj4gcmFuZ2UgPj4gbjEgPj4gbjIgPj4gbjM7CiAgICB0b3RhbHJvdGF0aW9uICs9ICgyKnJhbmdlICsgbjEpICsgKG4xKyhyYW5nZS1uMikpICsgKHJhbmdlIC0gbjIgKyBuMyk7CiAgICBjb3V0IDw8IHRvdGFscm90YXRpb24gPDwgZW5kbDsKICAgIHJldHVybiAwOwp9