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

public class Main {
    static int[][] scores;
    static int[][] dp;
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());
        HashMap<Integer, Integer> map = new HashMap<>();
        HashMap<Integer, Integer> next = new HashMap<>();
        map.put(0, 0);
        for (int i = 0; i < n; i++) {
            String[] line = br.readLine().split(" ", 2);
            int a = Integer.parseInt(line[0]);
            int b = Integer.parseInt(line[1]);
            for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
                int key = entry.getKey();
                int value = entry.getValue();
                if (!next.containsKey(key) || next.get(key) >= value + b) {
                    next.put(key, value + b);
                }
                key += a;
                if (!next.containsKey(key) || next.get(key) >= value) {
                    next.put(key, value);
                }
            }
            map = next;
            next = new HashMap<>();
        }
        int min = Integer.MAX_VALUE;
        for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
            min = Math.min(min, Math.max(entry.getKey(), entry.getValue()));
        }
        System.out.println(min);
    }
}