#include "bits/stdc++.h"

using ll = long long;
using namespace std;

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;

    vector<int> a(n), b(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i] >> b[i];
    }

    auto cost = [&](int m) -> int {
        set<int> all;
        for (int i = 0; i < n; i++) {
            all.insert(i);
        }

        auto best = [&](int top) -> int {
            int res = -1;

            for (int i : all) {
                if (top >= a[i]) {
                    if (res == -1 || (res != -1 && b[res] < b[i])) {
                        res = i;
                    }
                }
            }

            return res;
        };

        int sum = 0;
        for (int i = 0; i < n; i++) {
            sum += b[i];
        }

        for (int i = m; i < n; i++) {
            int j = best(i);
            if (j == -1) {
                return INT32_MAX;
            } else {
                sum -= b[j];
                all.erase(j);
            }
        }

        return sum;
    };

    int ans = INT32_MAX;

    for (int i = 0; i <= n; i++) {
        ans = min(ans, cost(i));
    }

    cout << ans << '\n';
    return 0;
}