#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
#include <vector>
#include <deque>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <algorithm>
#include <functional>
#include <utility>
#include <bitset>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cstdio>

using namespace std;


int main() {
    int a1, a2, a3, b;
    cin >> a1 >> a2 >> a3 >> b;

    int ans = max(a1 + a2 + a3 + b, 3 * a3);
    cout << ans << endl;
    return 0;
}