#include<bits/stdc++.h>
using namespace std;

typedef long long int ll;
typedef unsigned long long int llu;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<pair<int, int> > vii;

#define rrep(i, m, n) for(int i=m; i<n;  i++)
#define erep(i, n)    for(int i=1; i<=n; i++)
#define  rep(i, n)    for(int i=0; i<n;  i++)
#define rrev(i, m, n) for(int i=n-1; i>=m; i--)
#define erev(i, n)    for(int i=n; i>=1; i--)
#define  rev(i, n)    for(int i=n-1; i>=0; i--)
#define EACH(v)       (v).begin(), (v).end()
#define CNT(a, n, x)  (upper_bound(a, a+n, x)-lower_bound(a, a+n, x))
#define minup(m, x)   (m=min(m, x))
#define maxup(m, x)   (m=max(m, x))
#define mp            make_pair

#define INF 1000000000
#define MOD 1000000009
#define EPS 1E-9

#define MAX_N 10000
#define MAX_V 10000
#define MAX_T 10000

int n;
bool dp[MAX_V+MAX_T+1];

int main()
{
  cin >> n;
  vii vt(n);
  rep(i, n) cin >> vt[i].first >> vt[i].second;

  sort(EACH(vt));

  dp[0] = true;
  rep(i, n) rev(j, vt[i].second)  dp[vt[i].first + j] |= dp[j];

  rev(i, MAX_V+MAX_T) if(dp[i]){
    cout << i << endl;
    break;
  }

  return 0;
}