#include <bits/stdc++.h>
using namespace std;
ifstream in("rubaba.in");
ofstream out("rubaba.out");
typedef long double ld;
ld xmax=0,xmin=1e6,ymax=0,ymin=1e6;
int main()
{
    int n;
    ld x,y;
    in>>n;
    for(int i=1;i<=n;++i)
    {
        in>>x>>y;
        xmin=min(xmin,x);
        xmax=max(xmax,x);
        ymin=min(ymin,y);
        ymax=max(ymax,y);
    }
    out<<(xmax-xmin)*(ymax-ymin)<<'\n';
    return 0;
}