#include <bits/stdc++.h>
using namespace std;
template <typename T>
std::ostream &operator<<(std::ostream &out, vector<T> &v) {
  for (typename vector<T>::size_type i = 0; i < v.size(); ++i)
    out << v[i] << " ";
  out << "\n";
  return out;
}
template <typename T>
std::ostream &operator<<(std::ostream &out, set<T> &s) {
  for (auto e : s) out << e << " ";
  out << "\n";
  return out;
}
template <typename T, typename N>
std::ostream &operator<<(std::ostream &out, pair<T, N> &p) {
  out << "(" << p.first << ", " << p.second << ") ";
  out << "\n";
  return out;
}
template <typename T, typename N>
std::ostream &operator<<(std::ostream &out, vector<pair<T, N> > &v) {
  for (size_t i = 0; i < v.size(); ++i) cout << v[i];
  out << "\n";
  return out;
}
template <typename T>
std::ostream &operator<<(std::ostream &out, vector<vector<T> > &v) {
  for (size_t i = 0; i < v.size(); ++i) {
    for (size_t j = 0; j < v[i].size(); ++j) {
      out << v[i][j] << " ";
    }
    out << "\n";
  }
  return out;
}
template <typename T>
std::ostream &operator<<(std::ostream &out, vector<set<T> > &v) {
  for (size_t i = 0; i < v.size(); ++i) {
    out << v[i];
  }
  out << "\n";
  return out;
}
constexpr long long mod = 1e9 + 7;
long long big_pow(long long a, long long b) {
  long long res = 1;
  while (b) {
    if (b & 1) {
      res = (res * a) % mod;
    }
    a = (a * a) % mod;
    b >>= 1;
  }
  return res % mod;
}
void solve() {
  int n;
  cin >> n;
  vector<int> x(n);
  for (int i = 0; i < n; ++i) {
    cin >> x[i];
  }
  vector<long long> powers(n + 1);
  powers[0] = 1;
  for (int i = 1; i <= n; ++i) {
    powers[i] = powers[i - 1] * 2;
    powers[i] %= mod;
  }
  sort(x.begin(), x.end());
  long long ans = 0;
  for (int i = 1; i < n; ++i) {
    long long p = (powers[i] - 1) * (powers[n - i] - 1);
    p %= mod;
    ans += ((x[i] - x[i - 1]) * p) % mod;
    ans %= mod;
  }
  cout << ans << "\n";
  return;
}
int main() {
  std::ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t;
  t = 1;
  while (t--) {
    solve();
  }
  return 0;
}
