#include <stdio.h>
#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
using mint = modint998244353;
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000

int main(){
	
	int n;
	cin>>n;
	
	vector<int> v(n),t(n);
	vector<pair<int,int>> p;
	rep(i,n){
		cin>>v[i]>>t[i];
		p.emplace_back(v[i]+t[i],i);
	}
	
	sort(p.begin(),p.end());
	
	vector<bool> dp(20005,false);
	dp[0] = true;
	
	rep(i,n){
		vector<bool> ndp(20005,false);
		rep(j,20005){
			if(dp[j]==false)continue;
			ndp[j] = true;
			if(j < t[p[i].second]){
				ndp[j + v[p[i].second]] = true;
			}
		}
		swap(dp,ndp);
	}
	
	int ans = 0;
	rep(i,dp.size()){
		if(dp[i])ans = i;
	}
	cout<<ans<<endl;
	
	return 0;
}