#include <bits/stdc++.h>
int main()
{
    int N;
    std::cin >> N;
    using P = std::pair<int, int>;
    std::vector<P> D(N);
    for (int i = 0; i < N; i++) { std::cin >> D[i].first >> D[i].second; }
    std::sort(D.begin(), D.end(), [](const P& p1, const P& p2) { return p1.first + p1.second < p2.first + p2.second; });
    std::bitset<20001> dp;
    dp[0] = true;
    for (const auto& p : D) {
        for (int i = 0; i < p.second; i++) { dp[i + p.first] = dp[i] | dp[i + p.first]; }
    }
    for (int i = 20000; i >= 0; i--) {
        if (dp[i]) { return std::cout << i << std::endl, 0; }
    }
    return 0;
}