#include "bits/stdc++.h"
using namespace std;
set<long long int >get_all(vector<pair<long long int,long long int>>v) {
	set<long long int>aset;
	for (int i = 0; i < (1 << v.size()); ++i) {
		bitset<20>bs(i);
		long long int sum = 0;
		for (int j = 0; j < v.size(); ++j) {
			if (bs[j])sum += v[j].first;
			else sum -= v[j].second;
		}
		aset.emplace(sum);
	}
	return aset;
}
int main() {
	int N; cin >> N;
	vector<pair<long long int,long long int>>ds;
	for (int i = 0; i < N; ++i) {
		long long int a, b; cin >> a >> b;
		ds.emplace_back(a, b);
	}
	auto aset(get_all(vector<pair<long long int, long long int>>(ds.begin(), ds.begin() + N / 2)));
	auto bset(get_all(vector<pair<long long int, long long int>>(ds.begin() + N / 2, ds.end())));
	long long int ans = 1e18;
	for (auto as : aset) {
		auto it = bset.lower_bound(-as);
		if (it != bset.end()) {
			ans = min(ans, abs(*it+ as));
			
		}
		if (it != bset.begin()) {
			ans = min(ans, abs(*(prev(it))+ as));
		}
		
	}
	cout << ans << endl;
	return 0;
}