ert

/**
    author:  SALEH  * -- *
**/

# include <bits/stdc++.h>

using namespace std;

# define ll long long
# define ull unsigned long long
# define _FastIO ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)

ll const MAX = 1e5 + 5;
ll k,w1,w2,h1,h2;
int tree[MAX];
int a[MAX];


int main()
{
  _FastIO;
  //freopen("beads.in", "r", stdin);
    //freopen("beads.out", "w", stdout);
    int l,r,q;
    cin >> w1 >> h1 >> w2 >> h2;
    k = 2 * (w1 + h1 + w2 + h2 + 4 - w2 - 2);
    cout << k << endl;
    return 0;
}