#include <bits/stdc++.h>   using namespace std;   int main() {     long long n;     cin >> n;     vector<pair<long long, long long>> v;     for (long long i = 0; i < n; i++) {       long long a, b;       cin >> a >> b;       v.push_back(make_pair(a, b));     }     if (n & 1)       cout <<  no ;     else {       int flag = 0;       for (long long i = 1; i <= n / 2 - 1; i++) {         if ((v[i - 1].first + v[i - 1 + n / 2].first ==              v[i].first + v[i + n / 2].first) &&             (v[i - 1].second + v[i - 1 + n / 2].second ==              v[i].second + v[i + n / 2].second)) {           continue;         } else {           flag++;           break;         }       }       if (flag)         cout <<  no ;       else         cout <<  yes ;       return 0;     }   }   