#pragma GCC optimize("O3")
#pragma GCC target("avx")

#include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;

// Types
using ll = long long int;
using str = string;
template <class T> using u_set = unordered_set<T>;
template <class K, class V> using u_map = unordered_map<K, V>;
template <class V> using graph = u_map<V, u_set<V>>;

namespace io {
// Input
using IS = istream;
IS &in(IS &i);
IS &in(IS &i) { return i; }
template <class T, class... Ts> IS &in(IS &i, T &a, Ts &... as) {
  return in(i >> a, as...);
}
template <class V> IS &operator>>(IS &i, vector<V> &a) {
  for_each(a.begin(), a.end(), [&i](auto &e) { i >> e; });
  return i;
}
template <class F, class S> IS &operator>>(IS &i, pair<F, S> &p) {
  return in(i, p.first, p.second);
}
template <class... Ts, size_t... I>
IS &tuple_in(IS &i, tuple<Ts...> &t, index_sequence<I...>) {
  return in(i, get<I>(t)...);
}
template <class... Ts> IS &operator>>(IS &i, tuple<Ts...> &t) {
  return tuple_in(i, t, make_index_sequence<sizeof...(Ts)>());
}
// Output
using OS = ostream;
OS &out(OS &o) { return o << endl; }
template <class T> OS &out(OS &o, T const &a) { return o << a << endl; }
template <class T, class... Ts> OS &out(OS &o, T const &a, Ts const &... as) {
  return out(o << a << " ", as...);
}
template <class F, class S> OS &operator<<(OS &o, pair<F, S> const &p) {
  return o << p.first << ":" << p.second;
}
template <class... Ts> OS &args_out(OS &o, Ts const &... ts);
OS &args_out(OS &o) { return o; }
template <class T> OS &args_out(OS &o, T const &t) { return o << t; }
template <class T0, class T1, class... Ts>
OS &args_out(OS &o, T0 const &t0, T1 const &t1, Ts const &... ts) {
  return args_out(o << t0 << ",", t1, ts...);
}
template <class... Ts, size_t... I>
OS &tuple_out(OS &o, tuple<Ts...> const &t, index_sequence<I...>) {
  return args_out(o, get<I>(t)...);
}
template <class... Ts> OS &operator<<(OS &o, tuple<Ts...> const &t) {
  return tuple_out(o << "(", t, make_index_sequence<sizeof...(Ts)>()) << ")";
}
template <
    class C,
    class T = typename iterator_traits<typename C::iterator>::value_type,
    typename enable_if<!is_same<C, str>::value, nullptr_t>::type = nullptr>
OS &operator<<(OS &o, C const &a) {
  return a.empty() ? (o << "[]") : ([&o, &a]() -> OS & {
    o << "[" << *a.begin();
    for_each(next(a.begin()), a.end(), [&o](auto const &e) { o << "," << e; });
    return o << "]";
  }());
}
} // namespace io
auto input = [](auto &... a) { io::in(cin, a...); };
auto print = [](auto const &... a) { io::out(cout, a...); };
#ifdef JUMPAKU_DEBUG
auto dump = [](auto const &... a) { io::out(cout, a...); };
#else
auto dump = [](auto const &... a) {};
#endif

// Hash
namespace hashcode {
template <class... Ts> size_t hash_args(size_t h, Ts const &... ts);
size_t hash_args(size_t h) { return h; }
template <class T, class... Ts>
size_t hash_args(size_t h, T const &t, Ts const &... ts) {
  return hash_args(((h << 10) - h + hash<T>{}(t)), ts...);
}
template <class... Ts, size_t... I>
size_t hash_tuple(tuple<Ts...> const &t, index_sequence<I...>) {
  return hash_args(1089283, get<I>(t)...);
}
} // namespace hashcode
namespace std {
template <class... Ts> struct hash<tuple<Ts...>> {
  size_t operator()(tuple<Ts...> const &t) const {
    return hashcode::hash_tuple(t, index_sequence_for<Ts...>());
  }
};
} // namespace std

// Range
vector<ll> range(ll const &begin, ll const &end) {
  vector<ll> ret(max(0LL, end - begin));
  iota(ret.begin(), ret.end(), begin);
  return ret;
}
vector<ll> range(ll const &end) { return range(0, end); }
template <class T = ll> vector<T> vec(size_t n, T &&init = T()) {
  return vector<T>(n, init);
}
template <class Itr, class T = typename iterator_traits<Itr>::value_type>
vector<T> vec(Itr begin, Itr end) {
  return vector<T>(begin, end);
}

// MOD
ll gcd(ll p, ll q) { return (q == 0) ? p : gcd(q, p % q); }
ll lcm(ll p, ll q) { return p * q / gcd(q, p); }
ll pow(ll a, ll n, ll m) {
  if (n == 0)
    return 1;
  if (n & 1)
    return ((a % m) * pow(a, n - 1, m)) % m;
  auto b = pow(a, n / 2, m);
  return (b * b) % m;
}
ll inv(ll a, ll p) { return pow(a, p - 2, p); }
constexpr ll MOD = 1e9 + 7;

int main() {
  ll N;
  input(N);
  auto A = vec(N);
  input(A);
  auto B = vec(N);
  partial_sum(A.begin(), A.end(), B.begin());
  ll ans = 1e16;
  for (auto &&i : range(N - 1)) {
    auto l = B[i];
    auto r = B[N - 1] - B[i];
    dump(l, r);
    ans = min(ans, abs(r - l));
  }
  dump(A, B);
  print(ans);
  /*
    input(H, W, K);
    auto s = vec(H, vec<char>(W));
    input(s);

    auto z = s;
    dump(H, W, K, s);
    using Pos = tuple<ll, ll>;
    auto pos = vector<Pos>{};
    pos.reserve(K);
    for (auto &&i : range(H)) {
      for (auto &&j : range(W)) {
        if (s[i][j] == '#')
          pos.emplace_back(i, j);
      }
    }
    dump(pos);
    auto ans = vec(H, vec<ll>(W));
    for (auto &&k : range(K)) {
      auto pi = get<0>(pos[k]);
      auto pj = get<1>(pos[k]);
      auto t = pi;
      ans[t][pj] = k + 1;
      while (t > 0 && s[t - 1][pj] == '.') {
        --t;
        s[t][pj] = '#';
        ans[t][pj] = k + 1;
      }
      auto b = pi;
      ans[b][pj] = k + 1;
      while (b < H - 1 && s[b + 1][pj] == '.') {
        ++b;
        s[b][pj] = '#';
        ans[b][pj] = k + 1;
      }
      auto row = range(t, b + 1);
      auto l = pj;
      for (auto const &x : row)
        ans[x][l] = k + 1;
      while (l > 0 && all_of(row.begin(), row.end(),
                             [&s, l](auto x) { return s[x][l - 1] == '.'; })) {
        --l;
        for (auto const &x : row) {
          s[x][l] = '#';
          ans[x][l] = k + 1;
        }
      }
      auto r = pj;
      for (auto const &x : row)
        ans[x][l] = k + 1;
      while (r < W - 1 && all_of(row.begin(), row.end(), [&s, r](auto x) {
               return s[x][r + 1] == '.';
             })) {
        ++r;
        for (auto const &x : row) {
          s[x][r] = '#';
          ans[x][r] = k + 1;
        }
      }
    }

    for (auto &&i : range(H)) {
      for (auto &&j : range(W)) {
        printf("%lld%s", ans[i][j],
               j == W - 1 ? ""
                          : " "); // cout << ans[i][j] << (j == W - 1 ? "" : "
    ");
      }
      printf("\n");
    }*/
}


Measured memory_bytes: 4992