#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);
}
// if(v1.size()==0 || v2.size()==0){
// cout<<0<<endl;
// exit(0);
// }
sort(v1.begin(),v1.end());
sort(v2.begin(),v2.end());
int i=v1.size()-1,j=v2.size()-1;
int ha=0;
double ans1=0,ans2=0;
double ans=0.0000;
int ka=0;
while(ha==0){
if(i<0 || j<0){
break;
}
ans1+=v1[i];
ka++;
ans2+=v2[j];
ka++;
if(v1[i]>v2[j]){
//int bati=v2[j];
while(int(ans2)<int(ans1)){
j--;
if(j<0){
ha=1;
break;
}
//bati+=v2[j];
ans2+=v2[j];
ka++;
ans=max(ans,min(ans1-ka,ans2-ka));
}
i--;
}
else{
while(int(ans1)<int(ans2)){
i--;
if(i<0){
ha=1;
break;
}
ans1+=v1[i];
ka++;
ans=max(ans,min(ans1-ka,ans2-ka));
}
j--;
}
//cout<<ans1<<" "<<ans2<<endl;
// if(min(ans1-ka,ans2-ka)>=ans){
// cout<<ans1<<" "<<ans2<<" "<<ka<<endl;
// }
ans=max(ans,min(ans1-ka,ans2-ka));
}
printf("%.4lf",(double)ans);
}
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