import java.io.*;
import java.util.*;

public class Main {
    static int[] marks;
    static int[] books;
    static int[][] dp;
    static int n;
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        n = sc.nextInt();
        marks = new int[n];
        books = new int[n];
        for (int i = 0; i < n; i++) {
            marks[i] = sc.nextInt();
            books[i] = sc.nextInt();
        }
        dp = new int[1 << n][n];
        int ans = Integer.MAX_VALUE;
        for (int i = 0; i < n; i++) {
            ans = Math.min(ans, dfw((1 << n) - 1, i));
        }
        System.out.println(ans);
    }
    
    static int dfw(int mask, int idx) {
        if (getPop(mask) == 1) {
            return 0;
        }
        if (dp[mask][idx] == 0) {
            dp[mask][idx] = Integer.MAX_VALUE / 2;
            for (int i = 0; i < n; i++) {
                if (i == idx || (mask & (1 << i)) == 0) {
                    continue;
                }
                dp[mask][idx] = Math.min(dp[mask][idx], Math.max(dfw(mask ^ (1 << idx), i), books[i] - marks[i] + marks[idx]));
            }
        }
        return dp[mask][idx];
    }
    
    static int getPop(int x) {
        int pop = 0;
        while (x > 0) {
            pop += x % 2;
            x >>= 1;
        }
        return pop;
    }
    
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}