#include
using namespace std;
int main() {
int n;
pair<int,int>a[100],b[100];
int ar=0;
cin>>n;
for(int i=0;i<n;i++)
{
cin>>a[i].first>>a[i].second;
}
for(int i=0;i<n-1;i++)
{
b[i].first=a[i].first-a[i+1].first;
b[i].second=a[i].second-a[i+1].second;
if(b[i].first<0)
b[i].first=-1*b[i].first;
if(b[i].second<0)
b[i].second=-1*b[i].second;
ar=max(ar,(b[i].first-1)*(b[i].second-1));
}
cout<<ar;
return 0;
}