#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

string to_string(string a) { return '"' + a + '"'; }
string to_string(char a) { return "'" + string(1, a) + "'"; }
string to_string(const char* a) { return to_string((string) a); }
string to_string(bool a) { return a ? "true" : "false"; }
template <class T1, class T2>
string to_string(pair<T1, T2> a) {
    return "(" + to_string(a.first) + ", " + to_string(a.second) + ")";
}
template <class T>
string to_string(T a) {
    bool first = true; string res = "{";
    for (const auto& i : a) {
        if (!first) res += ", ";
        first = false;
        res += to_string(i);
    }
    res += "}";
    return res;
}
void debug_out() { cerr << endl; }
template <class T1, class... T2>
void debug_out(T1 a, T2... b) {
    cerr << " " << to_string(a);
    debug_out(b...);
}

#ifdef LOCAL
#define out(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define out(...) 42
#endif

clock_t start_time; void start_timer() { start_time = clock(); }
double get_time() { return (double) (clock() - start_time) / CLOCKS_PER_SEC; }

void Solve();

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
#ifdef LOCAL
    freopen("../input.txt", "r", stdin);
#endif
    start_timer();
    Solve();
#ifdef LOCAL
    cerr << fixed << setprecision(3);
    cerr << endl << "Time spent: " << get_time() << endl;
#endif
    return 0;
}

const int N = 55;
const int inf = 1e9;
const int MAX = 1e5 + 5;

int a[N];
int b[N];
vector<pair<int, int>> c;
vector<pair<int, int>> d;

void Solve() {
    int n;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i];
    }
    c = {{0, 0}};
    for (int i = 1; i <= n; i++) {
        d.clear();
        for (auto [x, y] : c) {
            d.emplace_back(x + a[i], y);
            d.emplace_back(x, y + b[i]);
        }
        sort(d.begin(), d.end());
        d.erase(unique(d.begin(), d.end()), d.end());
        c.clear();
        int mn_y = inf;
        for (auto [x, y] : d) {
            if (abs(x - y) > MAX) {
                continue;
            }
            if (mn_y > y) {
                c.emplace_back(x, y);
                mn_y = y;
            }
        }
    }
    int ans = inf;
    for (auto [x, y] : c) {
        ans = min(ans, max(x, y));
    }
    cout << ans << "\n";
}