#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cmath>
#include<cctype>
#include<math.h>
#include<string>
#include<string.h>
#include<stack>
#include<queue>
#include<vector>
#include<utility>
#include<set>
#include<map>
#include<stdlib.h>
#include<iomanip>

using namespace std;

#define ll long long
#define ld long double
#define EPS 0.0000000001
#define INF 1e9
#define LINF (ll)INF*INF
#define MOD 1000000007
#define rep(i,n) for(int i=0;i<(n);i++)
#define loop(i,a,n) for(int i=a;i<(n);i++)
#define all(in) in.begin(),in.end()
#define shosu(x) fixed<<setprecision(x)

#define int ll //!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

typedef vector<int> vi;
typedef vector<string> vs;
typedef pair<int,int> pii;
typedef vector<pii> vp;

int gcd(int a, int b){
    if(b==0) return a;
    return gcd(b,a%b);
}
int lcm(int a, int b){
    return a*b/gcd(a,b);
}

vector<vi> dp;
vi a,b;
int n;

int dfs(int bit, int last){
    if(dp[bit][last] != -1)return dp[bit][last];
    int ret = INF;
    int ne = bit - (1<<last);
    rep(i,n)if(ne & 1<<i){
        int t = max(dfs(ne,i), b[i] - a[i] + a[last]);
        ret = min(ret, t);
    }
    dp[bit][last] = ret;
    return ret;
}

signed main(void) {
    cin >> n;
    a = b = vi(n);
    rep(i,n) cin >> a[i] >> b[i];
    dp = vector<vi> (1<<n,vi(n,-1));
    rep(i,n){
        dp[1<<i][i] = 0;
    }
    int ans = INF;
    rep(i,n){
        ans = min(ans,dfs((1<<n)-1,i));
    }
    cout << ans << endl;
}