#line 1 "main.cpp"

/**
 * @title Template
 */

#include <iostream>
#include <algorithm>
#include <utility>
#include <numeric>
#include <vector>
#include <array>

template <class T, class U>
inline bool chmin(T &lhs, const U &rhs) {
  if (lhs > rhs) { lhs = rhs; return true; }
  return false;
}

template <class T, class U>
inline bool chmax(T &lhs, const U &rhs) {
  if (lhs < rhs) { lhs = rhs; return true; }
  return false;
}

struct range {
  using itr = int64_t;
  struct iterator {
    itr i;
    constexpr iterator(itr i_) noexcept : i(i_) { }
    constexpr void operator ++ () noexcept { ++i; }
    constexpr itr operator * () const noexcept { return i; }
    constexpr bool operator != (iterator x) const noexcept { return i != x.i; }
  };
  const iterator l, r;
  constexpr range(itr l_, itr r_) noexcept : l(l_), r(std::max(l_, r_)) { }
  constexpr iterator begin() const noexcept { return l; }
  constexpr iterator end() const noexcept { return r; }
};

struct revrange {
  using itr = int64_t;
  struct iterator {
    itr i;
    constexpr iterator(itr i_) noexcept : i(i_) { }
    constexpr void operator ++ () noexcept { --i; }
    constexpr itr operator * () const noexcept { return i; }
    constexpr bool operator != (iterator x) const noexcept { return i != x.i; }
  };
  const iterator l, r;
  constexpr revrange(itr l_, itr r_) noexcept : l(l_ - 1), r(std::max(l_, r_) - 1) { }
  constexpr iterator begin() const noexcept { return r; }
  constexpr iterator end() const noexcept { return l; }
};

using i32 = int32_t;
using i64 = int64_t;
using u32 = uint32_t;
using u64 = uint64_t;

constexpr i32 inf32 = (i32(1) << 30) - 1;
constexpr i64 inf64 = (i64(1) << 62) - 1;

int main() {
  std::array<i64, 5> get{};
  for (auto &x: get) {
    std::cin >> x;
  }
  i64 min = std::accumulate(get.begin(), get.end(), i64(0)) / 3;
  for (auto i: range(0, 32)) {
    std::array<i32, 5> coeff{};
    for (auto j: range(0, 5)) {
      coeff[j] = (i >> j & 1);
    }
    bool ok = true;
    for (auto j: range(0, 5)) {
      i32 tmp = 0;
      for (auto k: range(0, 3)) {
        tmp += coeff[(j + k) % 5];
      }
      if (tmp == 0) {
        ok = false;
        break;
      }
    }
    if (ok) {
      i64 sum = 0;
      for (auto j: range(0, 5)) {
        sum += get[j] * coeff[j];
      }
      chmin(min, sum);
    }
  }
  std::cout << min << '\n';
  return 0;
}