#include <bits/stdc++.h>
#define int long long
using namespace std;
const int inf = 1e18;
int32_t main() {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
map<int, int> o, v;
int n;
cin >> n;
for (int i = 1; i <= n; i++) {
int a, b;
cin >> a >> b;
o[a], v[b];
}
int mo = -inf, mv = -inf;
int ult = inf;
if (o.size() == 1 || v.size() == 1) {
cout << -1;
return 0;
}
for (auto [a, pula] : o) {
mo = max(mo, a - ult);
ult = a;
}
ult = inf;
for (auto [a, pula] : o) {
mv = max(mv, a - ult);
ult = a;
}
cout << mo * mv;
return 0;
}
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