#include <bits/stdc++.h>
using namespace std;
 
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  
  int A[3], B, ans, maxa, maxc;
  cin >> A[0] >> A[1] >> A[2] >> B;
  maxc = A[0] + A[1] + A[2] + B;
  maxa = *max_element(A, A+3) * 3;
  ans = max(maxa, maxc);
  cout << ans << endl;
  
  return 0;
}