#include <iostream>
#include <algorithm>
#include <cstring>
#include <sstream>
#include <map>
#include <queue>
#include <set>
#include <vector>
#include <stack>
#include <cstdio>
#include <cmath>
#define mk make_pair
#define pb push_back
#define printf printf_s
#define scanf scanf_s
using namespace std;
typedef long long int ll;
typedef pair<ll, ll> pos;
const ll MOD = 1000000007, N = 100000, dx[4] = { -1,1,0,0 }, dy[4] = { 0,0,-1,1 }, MIN = -72340172838076673, MAX = 72340172838076673;

ll mn(ll a, ll b) {
	if (a == -1)return b;
	if (b == -1)return a;
	return min(a, b);
}
ll gcd(ll v1, ll v2) {
	if (v1 == 0)return v2; if (v2 == 0)return v1; if (v2 > v1)return gcd(v2%v1, v1); return gcd(v1%v2, v2);
}

ll pw(ll v1, ll v2) {
	ll v3 = 1;
	while (v2 > 0) {
		if (v2 % 2)v3 = (v3*v1) % MOD;
		v1 = (v1*v1) % MOD;
		v2 /= 2;
	}
	return v3;
}

struct ab {
	ll a, b;
	bool operator<(const ab& right) const {
		return right.b*a - right.a*b < 0;
	}
};


ll n, dp[N],dv=0,ans=-1;

int main() {
	memset(dp, -1, sizeof(dp));
	dp[0] = 0;
	cin >> n;
	while (n--) {
		ll v1, v2; cin >> v1 >> v2;
		for (int i = dv; i >= 0; i--) {
			if (dp[i] == -1)continue;
			dp[i + v1] = mn(dp[i + v1], dp[i]);
			dp[i] = dp[i] + v2;
		}
		dv += v1;
	}
	for (ll i = N - 1; i >= 0; i--)
	{
		if(dp[i]!=-1)
		ans = mn(ans, max(dp[i], i));
	}cout << ans << endl;
	return 0;
}