#include <cassert>
#include <cmath>
#include <algorithm>
#include <iostream>
#include <iomanip>
#include <climits>
#include <map>
#include <queue>
#include <set>
#include <cstring>
#include <vector>

using namespace std;
typedef long long ll;
int N;
ll A[40];
ll B[40];

vector<ll> S;
vector<ll> T;

void dfs(int i, int end, ll a_sum, ll b_sum) {
  if (i == end) {
    if (end < N) {
      S.push_back(a_sum - b_sum);
    } else {
      T.push_back(a_sum - b_sum);
    }
  } else {
    dfs(i + 1, end, a_sum + A[i], b_sum);
    dfs(i + 1, end, a_sum, b_sum + B[i]);
  }
}

int main() {
  cin >> N;

  for (int i = 0; i < N; ++i) {
    cin >> A[i] >> B[i];
  }

  if (N == 1) {
    dfs(0, N, 0, 0);
  } else {
    dfs(0, N / 2, 0, 0);
    dfs(N / 2, N, 0, 0);
  }

  sort(S.begin(), S.end());
  sort(T.begin(), T.end());
  ll ans = LLONG_MAX;

  if (N >= 2) {
    int L = T.size() - 1;
    for (ll s : S) {
      int idx = lower_bound(T.begin(), T.end(), -s) - T.begin();
      idx = min(idx, L);

      ll diff = abs(s + T[idx]);
      if (idx - 1 >= 0) {
        diff = min(diff, abs(s + T[idx - 1]));
      }
      if (idx + 1 <= L) {
        diff = min(diff, abs(s + T[idx + 1]));
      }

      ans = min(ans, diff);
    }
  } else {
    for (ll t : T) {
      ans = min(ans, abs(t));
    }
  }

  cout << ans << endl;

  return 0;
}