#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int N;
	cin >> N;
	int X, Y;
	cin >> X >> Y;
	int kotae = Y - X;
	if (kotae <= 0) co(-1);
	else {
		int OK = 1;
		rep(i, N - 1) {
			int x, y;
			cin >> x >> y;

			if (kotae != y - x) OK = 0;
		}
		if (OK) co(kotae);
		else co(-1);
	}
	

	Would you please return 0;
}