#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include <debug_print.hpp>
#define debug(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#define debug(...) (static_cast<void>(0))
#endif

#define rep(i, a, n) for (int i = a; i < n; i++)
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> PII;
typedef double db;
const ll mod = 998244353;
const ll INF = 1LL << 60;
ll powmod(ll a, ll b) {
  ll res = 1;
  a %= mod;
  assert(b >= 0);
  for (; b; b >>= 1) {
    if (b & 1)
      res = res * a % mod;
    a = a * a % mod;
  }
  return res;
}
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll extgcd(ll a, ll b, ll &x, ll &y) {
  if (b == 0) {
    x = 1;
    y = 0;
    return a;
  }
  ll p = a / b;
  ll g = extgcd(b, a - b * p, y, x);
  y -= p * x;
  return g;
}
long long pow(long long x, long long n) {
  long long ret = 1;
  while (n > 0) {
    if (n & 1)
      ret *= x;
    x *= x;
    n >>= 1;
  }
  return ret;
}

template <class T> inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}

template <class T> inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}

struct Edge {
  ll to, cost, rev;
  Edge() {}
  Edge(ll to, ll cost) : to(to), cost(cost) {}
  Edge(ll to, ll cost, ll rev) : to(to), cost(cost), rev(rev) {}
};

using Graph = vector<vector<Edge>>;

const int dy[4] = {0, 1, 0, -1};
const int dx[4] = {1, 0, -1, 0};

int main() {
  ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  int a, b, o, w;
  cin >> a >> b >> o >> w;
  cout << o + max(a, b) + w << endl;
}