#include <iostream>
#include <vector>
#include <string>
#include <stack>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <algorithm>	// require sort next_permutation count __gcd reverse etc.
#include <cstdlib>	// require abs exit atof atoi 
#include <cstdio>		// require scanf printf
#include <functional>
#include <numeric>	// require accumulate
#include <cmath>		// require fabs
#include <climits>
#include <limits>
#include <cfloat>
#include <iomanip>	// require setw
#include <sstream>	// require stringstream 
#include <cstring>	// require memset
#include <cctype>		// require tolower, toupper
#include <fstream>	// require freopen
#include <ctime>		// require srand
#define rep(i,n) for(int i=0;i<(n);i++)
#define ALL(A) A.begin(), A.end()
#define each(i,c) for(auto i=(c).begin();i!=(c).end();++i)
#define exist(s,e) ((s).find(e)!=(s).end())
#define clr(a) memset((a),0,sizeof(a))
#define nclr(a) memset((a),-1,sizoef(a))
#define sz(s) (int)((s).size())
#define INRANGE(x,s,e) ((s)<=(x) && (x)<(e))
#define pb push_back
#define MP(x,y) make_pair((x),(y))
#define INF 1<<28

using namespace std;

typedef long long ll;
typedef pair<int, int> P;

int main()
{
	ios_base::sync_with_stdio(0);
	int N; cin >> N;
	vector<int> a(N, 0 ), b (N, 0 );
	rep (i, N ){
		cin >> a[i] >> b[i];
	} // end rep
	int mins = INF, maxs = 0;

	bool ok = true;
	rep (i, N ){
		int curr = a[i] + 4*b[i];
		mins = min (mins, curr );
		maxs = max (maxs, curr );
	} // end rep
	int diff = maxs - mins;
	if (diff % 2 != 0 ) ok = false;
	ll res = 0LL;
	if (ok ){
		rep (i, N ){
			int curr = diff + mins - (a[i] + 4*b[i] );
			if (curr % 2 != 0 ) ok = false;
			res = res + (ll)curr/2LL;
		} // end rep 
	} // end if 	
	cout << (ok ? res : -1 ) << endl;

	return 0;
}