#include <iostream>
using namespace std;

int dp[101][100001];

int main(){
  int n;cin>>n;
  for(int i = 0; 100 > i; i++){
    for(int j = 0; 100000 >= j; j++){
      dp[i][j] = 100001;
    }
  }
  dp[0][0] = 0;
  for(int i = 0; n > i; i++){
    int a,b;cin>>a>>b;
    for(int j = 0; 100000 > j; j++){
      if(!dp[i][j] && i+j != 0)continue;
      dp[i+1][j+a] = min(dp[i+1][j+a],dp[i][j]);
      dp[i+1][j] = min(dp[i+1][j],dp[i][j]+b);
    }
  }
  int ans = 100000;
  for(int i = 0; 100000 >= i; i++){
    ans = min(ans,max(i,dp[n][i]));
  }
  cout << ans << endl;
}