#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using vin = vector<int>;
using vll = vector<ll>;
using P = pair<int, int>;
const int inf = 1e9 + 7;
const ll INF = 1e18;
template <typename T>
void chmin(T &a, T b) {
  a = min(a, b);
}
template <typename T>
void chmax(T &a, T b) {
  a = max(a, b);
}
int main() {
  int n, a, b, c;
  cin >> n >> a >> b >> c;
  vin l(n);
  for (int i = 0; i < (n); ++i) cin >> l[i];
  ll ans = 0;
  cout << ans << endl;
}
