#include <bits/stdc++.h>

using namespace std;

const int INF = 1<<28;

int calc(int a, int b, int c, vector<int> &v) {
  int sum = 0;
  for (int x: v) {
    int ret = INF;
    for (int i = 0; a * i <= x; i++) {
      int y = x - a * i;
      for (int j = 0; b * j <= y; j++) {
        int z = y - b * j;
        if (z % c == 0) {
          ret = min(ret, i + j + z / c);
        }
      }
    }
    sum += ret;
  }
  return sum;
}

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  vector<int> v(4);
  for (int i = 0; i < 4; i++)
    cin >> v[i];

  int ret = INF;
  for (int a = 1; a <= 30; a++) {
    for (int b = 1; b < a; b++) {
      for (int c = 1; c < b; c++) {
        ret = min(ret, calc(a, b, c, v));
      }
    }
  }

  cout << ret << endl;
  
  return 0;
}