#include <bits/stdc++.h>
using namespace std;
int main(){
int n;
cin>>n;
vector<double>v1,v2;
for(int i=0; i<n; i++){
double j,k;
cin>>j>>k;
if(j>=k){
v1.push_back(j);
}
else v2.push_back(k);
}
sort(v1.begin(),v1.end());
sort(v2.begin(),v2.end());
int i=v1.size(),j=v2.size();
int ha=0;
double ans1=0,ans2=0;
double ans=0.0000;
int ka=0;
while(true){
i--;j--;
if(i<0 || j<0){
break;
}
ans1+=v1[i];
ka++;
ans2+=v2[j];
ka++;
if(ans2<ans1){
//int bati=v2[j];
while(ans2<ans1){
j--;
if(j<0){
break;
}
//bati+=v2[j];
ans2+=v2[j];
ka++;
ans=max(ans,min(ans1-ka,ans2-ka));
}
ans=max(ans,min(ans1-ka,ans2-ka));
}
else{
while(ans1<ans2){
i--;
if(i<0){
break;
}
ans1+=v1[i];
ka++;
ans=max(ans,min(ans1-ka,ans2-ka));
}
ans=max(ans,min(ans1-ka,ans2-ka));
}
//cout<<ans1<<" "<<ans2<<endl;
ans=max(ans,min(ans1-ka,ans2-ka));
}
printf("%.4lf",(double)ans);
}
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