#define EmiliaMyWife ios::sync_with_stdio(0); cin.tie(NULL); using ll = int64_t; /*--------------------------------------------------------------------------------------*/
signedmain(){ EmiliaMyWife int n; cin >> n; vector<ll> arr(n); ll s = 0; for(int i = 0; i < n; i++) cin >> arr[i], s += arr[i]; ll res = 0; for(int i = 0; i < n; i++) res += arr[i] * i; for(int i = -1; i < max(1, n / 2); i++) { if(~i) { res -= arr[i] * i; res -= arr[n - i - 1] * (n - i - 1); swap(arr[i], arr[n - i - 1]); res += arr[i] * i; res += arr[n - i - 1] * (n - i - 1); } if(res % s == 0) return cout << i + 1 << ' ' << res / s << '\n', 0; } }