#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cmath>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <sstream>
#include <string>

#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
#define var auto
#define mod 1000000007
#define inf 2147483647
typedef long long ll;

using namespace std;

int inputValue(){
    int a;
    cin >> a;
    return a;
}

template <typename T>
void output(T a, int precision) {
    if(precision > 0){
        cout << fixed << setprecision(precision)  << a << "\n";
    }
    else{
        cout << a << "\n";
    }
}

// end of template

int main() {
    // source code
    
    int N = inputValue();
    vector<pair<int, int>> T(N);
    rep(i, N){
        int v = inputValue(); // もらえる量
        int t = inputValue(); // 閾値
        T[i] = make_pair(t + v, t);
    }
    
    sort(T.begin(), T.end());
    
    vector<int> dp(20000, 0);
    int ret = 0;
    dp[0] = 1;
    
    rep(i, N){
        var tmp = dp;
        rep(j, dp.size()){
            if (tmp[j] && j < T[i].second) {
                dp[j + T[i].first - T[i].second] = 1;
                ret = max(ret, j + T[i].first - T[i].second);
            }
        }
    }
    
    output(ret, 0);
    
    
    return 0;
}