#include <bits/stdc++.h>

using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second

template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> pip;

const ll INF = 1ll<<29;
const ll MOD = 1000000007;
const double EPS = 1e-9;

int n;
ll a[32], b[32];

int main() {
	cin >> n;
	REP(i, n) scanf("%lld %lld", a + i, b + i);
	
	if (n == 1) {
		cout << min(a[0], b[0]) << endl;
		return 0;
	}
	
	vector<ll> v;
	REP(i, 1 << (n/2)) {
		ll suma = 0, sumb = 0;
		REP(j, n / 2) {
			if (i >> j & 1) suma += a[j];
			else sumb += b[j];
		}
		v.push_back(suma - sumb);
	}
	sort(ALL(v));
	
	
	ll ans = 1ll<<60;
	REP(i, 1<<(n-n/2)) {
		ll suma = 0, sumb = 0;
		REP(j, n-n/2) {
			if (i >> j & 1) suma += a[j + n/2];
			else sumb += b[j + n/2];
		}
		
		ll dif = suma - sumb;
		vector<ll>::iterator it = lower_bound(ALL(v), -dif);
		
		if (it != v.begin()) --it;
		REP(i, 2) {
			if (it == v.end()) break;
			chmin(ans, abs(dif + *it));
			++it;
		}
		
	}
	
	cout << ans << endl;
	
	return 0;
}