#define _USE_MATH_DEFINES
#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define MT make_tuple
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
#define RT return
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;
using vll = vector<ll>;

int dp[1 << 18][18], N, A[18], B[18];
const int INF = (int)1e9;

void solve() {
    cin >> N;
    rep(i, 1 << N)rep(j, N)dp[i][j] = INF;
    rep(i, N) {
        cin >> A[i] >> B[i];
        dp[1 << i][i] = 0;
    }

    rep(S, 1 << N) {
        rep(i, N) {
            rep(j, N)if (!(S >> j & 1)) {
                smin(dp[S | 1 << j][j], max(dp[S][i], B[i]-A[i]+A[j]));
            }
        }
    }

    int ans = INF;
    rep(i, N)smin(ans, dp[(1 << N) - 1][i]);
    cout << ans << endl;
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout << fixed << setprecision(15);
	solve();
	return 0;
}