#include <iostream>
#include <vector>
#include <algorithm>
#include <numeric>
#include <bitset>
#include <memory>
#define repeat(i,n) for (int i = 0; (i) < int(n); ++(i))
#define whole(f,x,...) ([&](decltype((x)) whole) { return (f)(begin(whole), end(whole), ## __VA_ARGS__); })(x)
using namespace std;
int main() {
    int n; cin >> n;
    vector<int> v(n), t(n); repeat (i,n) cin >> v[i] >> t[i];
    vector<int> ix(n); whole(iota, ix, 0);
    whole(iota, ix, 0);
    whole(sort, ix, [&](int i, int j) { return v[i] + t[i] < v[j] + t[j]; });
    auto dp = make_unique<bitset<2*10000+1> >();
    (*dp)[0] = true;
    for (int i : ix) {
        auto it = make_unique<bitset<2*10000+1> >();
        it->flip();
        *it <<= t[i];
        it->flip();
        *it &= *dp;
        *it <<= v[i];
        *dp |= *it;
    }
    for (int i = dp->size() - 1; i >= 0; -- i) {
        if ((*dp)[i]) {
            cout << i << endl;
            break;
        }
    }
    return 0;
}