#include <bits/stdc++.h>
using namespace std;
int maxx=0, maxy=0, minx=0, miny=0;
struct pozitie
{
    int x;
    int y;
}c[100000];
int main()
{
    int n;
    cin>>n;
    for (int i=1; i<=n; i++)
    {
        cin>>c[i].x>>c[i].y;
        if (c[i].x>maxx) maxx=c[i].x;
        if (c[i].y>maxy) maxy=c[i].y;
        if (c[i].x<minx) minx=c[i].x;
        if (c[i].y<miny) miny=c[i].y;
    }
    cout<<(maxx-minx)*(maxy-miny);
}