#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> V(N), T(N);
  for (int i = 0; i < N; i++){
    cin >> V[i] >> T[i];
  }
  vector<tuple<int, int, int>> S(N);
  for (int i = 0; i < N; i++){
    S[i] = make_tuple(V[i] + T[i], V[i], T[i]);
  }
  sort(S.begin(), S.end());
  for (int i = 0; i < N; i++){
    V[i] = get<1>(S[i]);
    T[i] = get<2>(S[i]);
  }
  vector<bool> dp(20000, false);
  dp[0] = true;
  for (int i = 0; i < N; i++){
    for (int j = T[i] - 1; j >= 0; j--){
      if (dp[j]){
        dp[j + V[i]] = true;
      }
    }
  }
  int ans = 0;
  for (int i = 0; i < 20000; i++){
    if (dp[i]){
      ans = max(ans, i);
    }
  }
  cout << ans << endl;
}