#define _USE_MATH_DEFINES
#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <complex>
#include <string>
#include <vector>
#include <array>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
#include <iterator>
using namespace std;

const int MAX = 1000;
const int INF = INT_MAX / 2;

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

    vector<int> dp(n*MAX+1, INF);
    dp[0] = 0;
    for(int i=0; i<n; ++i){
        vector<int> nextDp(n*MAX+1, INF);
        for(int j=0; j<=n*MAX; ++j)
            nextDp[j] = dp[j] + b[i];
        for(int j=a[i]; j<=n*MAX; ++j)
            nextDp[j] = min(nextDp[j], dp[j-a[i]]);
        dp = move(nextDp);
    }

    int ans = INF;
    for(int i=0; i<=n*MAX; ++i)
        ans = min(ans, max(i, dp[i]));
    cout << ans << endl;

    return 0;
}