#include "bits/stdc++.h"
using namespace std;
#define MAX 25000
bool dp[MAX];

int main(){
	int N;
	cin >> N;
	vector<pair<int, int>> temp(N);
	for (int i = 0; i < N; i++)
	{
		int v, t;
		cin >> v >> t;
		temp[i] = make_pair(v + t, t);
	}
	sort(temp.begin(), temp.end());
	vector<int> V(N), T(N);
	for (int i = 0; i < N; i++)
	{
		V[i] = temp[i].first - temp[i].second;
		T[i] = temp[i].second;
	}
	dp[0] = true;

	for (int i = 0; i < N; i++)
	{
		for (int j = T[i] - 1; j >= 0; j--)
		{
			dp[j + V[i]] |= dp[j];
		}
	}

	for (int i = MAX - 1; i >= 0; i--)
	{
		if (dp[i]){
			cout << i << endl;
			return 0;
		}
	}
}