import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        long [] B = new long [N];
        ArrayList<Long> L = new ArrayList<>();
        long AMAX = 0;
        for(int i=0; i<N; i++){
            long tmp = sc.nextLong();
            AMAX+=tmp;
            B[i] = tmp+sc.nextLong();
        }
        L.add(AMAX);
        for(int i=0; i<N; i++){
            for(int j=L.size()-1; j>=0; j--){
                long tmp = L.get(j);
                if(tmp<0)continue;
                L.add(L.get(j)-B[i]);
            }
        }
        long ans = AMAX;
        for(int j=L.size()-1; j>=0; j--){
            ans = Math.min(ans,Math.abs(L.get(j)));
        }
        System.out.println(ans);
    }
}