This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main()
{
long long n,cnt=0;
cin>>n;
// int x[n],y[n];
vector<pair<long long,long long>>v(n);
for(int i=0 ; i<n ; i++)
{
long long xx,yy;
cin>>xx>>yy;
yy/=2;xx/=2;
v[i]={xx,yy};
}
/*int mxxx=0,mxxy=0,mxyx=0,mxyy=0;
for (int i=0 ; i<n ; i++)
{
if(x[i]>mxxx)
{
mxxx=x[i];
mxxy=y[i];
}
if(x[i]==mxxx)
{
mxxy=max(mxxy,y[i]);
}
if(y[i]>mxyy)
{
mxyx=x[i];
mxyy=y[i];
}
if(y[i]==mxyy)
{
mxyx=max(mxyx,x[i]);
}
}
if(mxxx==mxyx && mxxy==mxyy)
{
cout<<mxxx*mxxy<<endl;
return 0;
}*/
// cnt+=mxxx*mxxy;
// mxyy-=mxxy;
// cnt+=mxyy*mxyx;
sort(v.begin(),v.end());
/*for (int i=0 ; i<v.size()-1 ; i++)
{
if(v[i].first==v[i+1].first)
{
v.erase(v.begin()+i);
i--;
}
}*/
/*for (int i=1 ; i<v.size() ; i++)
{
if(v[i].second<v[i-1].second && v[i].first==v[i-1].first)
{
v.erase(v.begin()+i);
i--;
}
}*/
reverse(v.begin(),v.end());
/*int j=0;
for(int i=0 ; i<n ; i++)
{
cnt+=v[i].first*(v[i].second-j);
// cout<<v[i].first<<" "<<v[i].second<<" "<<j<<" ";
// cout<<cnt<<endl;
j=v[i].second;
}*/
// int j=v[0].second,k=0,h=v[0].first;
// int j=v[v.size()-1].second,k=v.size()-1;
int j=0,k=0;
cnt=0;
// cout<<v[0].first<<" ";
/*for (int i=0 ; i<n; i++)
{
cout<<v[i].first<<" "<<v[i].second<<endl;
}*/
for(int i=v[0].first ; i>0 ; i--)
{
// cout<<v[j+1].first<<" ";
if(i==v[k].first && v[k].second>v[j].second) j=k;
if (i==v[k].first)k++;
cnt+=v[j].second;
// cnt+=v[i].second*(v[i].first-v[i-1].first);
// cout<<cnt<<"\n";
}
cout<<cnt*4<<endl;
}
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