#include <bits/stdc++.h>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
#define rep(i,m,n,k) for (int i = (int)(m); i < (int)(n); i += (int)(k))
#define rrep(i,m,n,k) for (int i = (int)(m); i > (int)(n); i += (int)(k))
#define ll long long
#define list(T,A,N) vector<T> A(N);for(int i=0;i<(int)(N);i++){cin >> A[i];}


int main(){
    
    int N;
    cin >> N;
    vector<pair<int,int>> VT(N);
    int v,t;
    rep(i,0,N,1){
        cin >> v >> t;
        VT[i] = {v,t};
    }
    sort(VT.begin(),VT.end());
    bitset<20000> S;
    bitset<20000> I;
    I.set(0,1);
    vector<bitset<20000>> msk(20000);
    msk[0].set(0,1);
    rep(i,0,19999,1){
        msk[i+1] = I|(msk[i]<<1);
    }
    S.set(0,1);
    for(auto [vv,tt]:VT){
        S |= (msk[tt-1]&S)<<vv;
    }
    int ans = 0;
    rep(i,0,20000,1){
        if (S.test(i)){
            ans = i;
        }
    }
    cout << ans << endl;
    return 0;

}