#include <bits/stdc++.h>

#define show(x) cout << #x << " = " << x << endl

using namespace std;
using ll = long long;
using pii = pair<int, int>;
using vi = vector<int>;

template <typename T>
ostream& operator<<(ostream& os, const vector<T>& v)
{
    os << "sz=" << v.size() << "\n[";
    for (const auto& p : v) {
        os << p << ",";
    }
    os << "]\n";
    return os;
}

template <typename S, typename T>
ostream& operator<<(ostream& os, const pair<S, T>& p)
{
    os << "(" << p.first << "," << p.second
       << ")";
    return os;
}


constexpr ll MOD = 1e9 + 7;

template <typename T>
constexpr T INF = numeric_limits<T>::max() / 100;

constexpr int MAXV = 10000;
constexpr int MAXIMUM = 20000;
bool check[MAXIMUM + 1];
bool prevcheck[MAXIMUM + 1];

struct House {
    int v;
    int t;
    bool operator<(const House& h) const
    {
        return v + t < (h.v + h.t);
    }
};

int main()
{
    int N;
    cin >> N;
    vector<House> house(N);
    for (ll i = 0; i < N; i++) {
        cin >> house[i].v >> house[i].t;
    }
    prevcheck[0] = true;
    sort(house.begin(), house.end());
    prevcheck[house[0].v] = true;
    ll maxi = house[0].v;
    for (ll i = 1; i < N; i++) {
        ll maxi2 = maxi;
        for (ll j = max(0LL, maxi - house[i].v + 1); j <= min(house[i].t - 1, MAXIMUM - house[i].v); j++) {
            if (prevcheck[j]) {
                maxi2 = max(j + house[i].v, maxi2);
                check[j + house[i].v] = true;
            }
        }
        maxi = maxi2;
        for (ll j = 0; j <= MAXIMUM; j++) {
            if (not prevcheck[j]) {
                prevcheck[j] = check[j];
            }
            check[j] = false;
        }
    }
    for (auto i = MAXIMUM; i >= 0; i--) {
        if (prevcheck[i]) {
            cout << i << endl;
            break;
        }
    }

    return 0;
}