#include <bits/stdc++.h>
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
using namespace std;
int mcd(int a,int b)
{
if (a>b)swap(a,b);
if (a==0)return b;
a = abs(a),b = abs(b);
return __gcd(a,b);
}
signed main()
{
int n;
cin >> n;
vector<pii> v(n);
for (int i = 0; i < n ;i++)
cin >> v[i].ff >> v[i].ss;
for (int i = n-1; i >= 0; i--)
v[i].ff-=v[0].ff,v[i].ss-=v[0].ss;
int x = 0, y = 0;
int px=0,py=0;
for (int i = 1; i < n; i++)
{
y = mcd(v[i].ss,y);
int add = 0;
if (v[i].ss == 0)
add = v[i].ff;
else if (py!=0)
{
int lc = v[i].ss*py/mcd(v[i].ss,py);
int c1 = lc/py;
int c2 = lc/v[i].ss;
add = c2*v[i].ff - c1*px;
px = v[i].ff;
py = v[i].ss;
}
x = mcd(x,add);
}
if (x*y == 0)
cout << -1;
else
cout << x*y;
return 0;
}
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