#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define REP(i,n) FOR(i,0,n)
#define FOR(i,a,b) for(ll i=a;i<b;i++)
#define PB push_back
#define LB lower_bound
#define UB upper_bound
#define PQ priority_queue
#define UM unordered_map
#define ALL(a) (a).begin(),(a).end()
#define MOD 1000000007
typedef vector<ll> vi;
typedef vector<vector<ll>> vvi;
const ll INF = (1ll << 30);
typedef pair<ll,ll> pii;
struct Edge{ ll s,t,c; };
typedef vector<vector<ll>> Graph;
typedef vector<pii> vpii;

vi f(vpii v) {
  ll n=v.size();
  vi ret;
  REP(i,(1ll<<n)) {
    ll sum=0;
    REP(j,n)
      if((1ll<<j)&i) sum+=v[j].first;
      else sum-=v[j].second;
    ret.PB(sum);
  }
  sort(ALL(ret));
  return ret;
}
int main() {
  ll n; cin>>n;
  vpii v(n); REP(i,n) cin>>v[i].first>>v[i].second;
  if(n==1) {
    cout<<min(v[0].first,v[0].second)<<endl;
    return 0;
  }
  vpii v1,v2;
  REP(i,n/2) v1.PB(v[i]);
  FOR(i,n/2,n) v2.PB(v[i]);
  vi a1=f(v1),a2=f(v2);
  ll ans=INF;
  for(ll i:a1) {
    auto it=lower_bound(ALL(a2),-i);
    if(it!=a2.end()) ans=min(ans,abs(*it+i));
    if(it!=a2.begin()) ans=min(ans,abs(*prev(it)+i));
  }
  cout<<ans<<endl;
}