#include <bits/stdc++.h>

using namespace std;

typedef long long int64;

int main()
{
  int64 N, A[32], B[32];
  cin >> N;
  for(int i = 0; i < N; i++) cin >> A[i] >> B[i];

  int mid = N / 2;
  vector< int64 > st;
  for(int i = 0; i < 1 << mid; i++) {
    int64 beet = 0;
    for(int j = 0; j < mid; j++) {
      if((i >> j) & 1) beet += A[j];
      else beet -= B[j];
    }
    st.push_back(beet);
  }
  sort(begin(st), end(st));
  st.erase(unique(begin(st), end(st)), end(st));

  int64 ret = 1LL << 58;
  for(int i = 0; i < 1 << (N - mid); i++) {
    int64 beet = 0;
    for(int j = mid; j < N; j++) {
      if((i >> (j - mid)) & 1) beet += A[j];
      else beet -= B[j];
    }
    auto p = lower_bound(begin(st), end(st), -beet);
    if(end(st) != p) ret = min(ret, llabs(*p + beet));
    if(begin(st) != p) ret = min(ret, llabs(*--p + beet));
  }
  cout << ret << endl;

}