#include<bits/stdc++.h>
using namespace std;
using ll = long long;
template<class T> using vt = vector<T>;
template<class T> using vvt = vector<vt<T>>;
template<class T> using ttt = tuple<T,T>;
using tii = tuple<int,int>;
using vi = vector<int>;
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define pb push_back
#define mt make_tuple
#define ALL(a) (a).begin(),(a).end()
#define FST first
#define SEC second
#define DEB cerr<<"!"<<endl
#define SHOW(a,b) cerr<<(a)<<" "<<(b)<<endl
#define DIV int(1e9+7)
const int INF = (INT_MAX/2);
const ll LLINF = (LLONG_MAX/2);
const double eps = 1e-8;
//const double PI = M_PI;  
inline ll pow(ll x,ll n,ll m){ll r=1;while(n>0){if((n&1)==1)r=r*x%m;x=x*x%m;n>>=1;}return r%m;}
inline ll lcm(ll d1, ll d2){return d1 / __gcd(d1, d2) * d2;}

/*Coding Space*/
// O(10^7)は定数
int dp[101][100001];
int main(){
  int n; cin >> n;
  fill_n(dp[0],101*100001,-1);
  dp[0][0] = 0;
  rep(i,n){
    int a,b; cin >> a >> b;
    rep(j,100001){
      if(dp[i][j] != -1){
        dp[i+1][j] = (dp[i+1][j+a] == -1?dp[i][j]+b:min(dp[i+1][j],dp[i][j]+b));
        dp[i+1][j+a] = (dp[i+1][j+a] == -1?dp[i][j]:min(dp[i+1][j+a],dp[i][j]));
      }
    }
  }
  int ans = INF;
  rep(j,100001)
    if(dp[n][j] != -1)
      ans = min(ans, max(dp[n][j],j));
  cout << ans << endl;
}