#include <bits/stdc++.h>
using namespace std;
const int N=1e5+5;
int n,l; double res,sum,sumTwo;
double a[N],b[N];
int main()
{
    ios_base::sync_with_stdio(NULL);
    cin.tie(NULL); cout.tie(NULL);
    cin >> n;
    for (int i=1;i<=n;i++)
    cin >> a[i] >> b[i];
    sort(a+1,a+n+1,greater<double>());
    sort(b+1,b+n+1,greater<double>());
    sum=sumTwo=0;
    l=1;
    for (int i=1;i<=n;i++)
    {
        sumTwo+=b[i];
        res=max(res,min(sum,sumTwo)-i-l+1);
        while (l<=n and sum<=sumTwo)
        {
            sum+=a[l];
            l++;
            res=max(res,min(sum,sumTwo)-i-l+1);
        }
    }
    cout << setprecision(4) << fixed << res;
}
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