#include <bits/stdc++.h>

#define rep(i, n) for (int (i) = 0; (i) < (int)(n); (i)++)

const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;

const int MAXN = 10010;

struct present {
    int v;
    int t;
    present() {}
    present(int v, int t) : v(v), t(t) {}
    bool operator<(const present& rhs) const {
        return v+t < rhs.v+rhs.t;
    }
};

present p[MAXN];
bool dp[2][2*MAXN];

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    for (int i = 0; i < N; i++) {
        int v, t;
        cin >> v >> t;
        p[i] = present(v, t);
    }
    sort(p, p+N);
    memset(dp, 0, sizeof(dp));
    dp[0][0] = true;
    for (int i = 0; i < N; i++) {
        int cur = i%2;
        int tar = cur^1;
        for (int t = 0; t <= MAXN; t++) {
            if (!dp[cur][t]) continue;
            dp[tar][t] = true;
            int tmp = t+p[i].v;
            if (t < p[i].t) dp[tar][tmp] = true;
        }
    }
    int ans = 0;
    for (int i = 0; i < 2*MAXN; i++) {
        if (dp[0][i] || dp[1][i]) ans = i;
    }
    cout << ans << endl;
    return 0;
}