// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

int main() {
    std::ios::sync_with_stdio(false);
    int n; cin >> n;
    int m = 1e5;
    std::vector<int> f(m + 1);
    while(n --) {
        std::vector<int> g(m + 1, 1e9);
        int a, b; cin >> a >> b;
        for(int i = 0; i <= m; i ++) {
            g[i] = std::min(g[i], f[i] + b);
            if(i >= a)
                g[i] = std::min(g[i], f[i - a]);
        }
        f = g;
    }
    int ans = 1e9;
    for(int i = 0; i <= m; i ++)
        ans = std::min(ans, std::max(i, f[i]));
    cout << ans << '\n';
}