#include <bits/stdc++.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;

const static int INF = (int)1e9;

int dp[105][100005];


int main(){
  int N;
  cin >> N;
  vector<vector<int>> adj(2, vector<int>(N));
  rep(i,N){
    cin >> adj[0][i] >> adj[1][i];
  }

  rep(i,105){
    rep(j,100005){
      dp[i][j] = INF;
    }
  }
  dp[0][0] = 0;

  rep(i,N){
    rep(j,100005){
      if(dp[i][j] == INF) continue;

      dp[i+1][j+adj[0][i]] = min(dp[i+1][j+adj[0][i]], dp[i][j]);
      dp[i+1][j] = min(dp[i+1][j], dp[i][j] + adj[1][i]);
    }
  }

  int ret = INF;
  rep(i,100005){
    ret = min(ret, max(i, dp[N][i]));
  }

  cout << ret << endl;
  
  return 0;
}