#include <bits/stdc++.h>
using namespace std;
template <typename T, typename U>
std::pair<T, U> operator+(const std::pair<T, U>& l, const std::pair<T, U>& r) {
  return {l.first + r.first, l.second + r.second};
}
typedef void (*callback_function)(void);
const long long INF64 = 1e18;
const long long INF32 = 1e9;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie();
  {
    long long n, q, x, y, r;
    cin >> n >> q;
    while (q--) {
      cin >> x >> y;
      r = (x + y) % 2;
      cout << n * ((x - 1) / 2) + ((n + 1 - r) / 2) * ((x - 1) % 2) +
                  (y + 1) / 2 + ((n * n + 1) / 2) * r
           << endl;
    }
  }
  return 0;
}
