#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
template <class T>
using vec = vector<T>;
template <class T>
using vvec = vector<vec<T>>;
using tp = tuple<ll, ll, ll>;
constexpr long long INF = 1LL << 60;
constexpr int INF_INT = 1 << 25;
constexpr long long MOD = (ll)1e9 + 7;
using ld = long double;
static const ld pi = 3.141592653589793L;
using Array = vector<ll>;
using Matrix = vector<Array>;
template <class T>
inline bool chmin(T &a, T b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
template <class T>
inline bool chmax(T &a, T b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
struct Edge {
  ll to, cap, rev;
  Edge(ll _to, ll _cap, ll _rev) {
    to = _to;
    cap = _cap;
    rev = _rev;
  }
};
void add_edge(vector<vector<Edge>> &G, ll from, ll to, ll cap, bool revFlag,
              ll revCap) {
  G[from].push_back(Edge(to, cap, (ll)G[to].size()));
  if (revFlag) G[to].push_back(Edge(from, revCap, (ll)G[from].size() - 1));
}
void solve() {
  ll n, q;
  cin >> n >> q;
  while (q--) {
    ll x, y;
    cin >> x >> y;
    x--;
    y--;
    ll xx = x / 2;
    ll num = xx * n;
    if ((x + y) % 2) {
      num += (n * n + 1) / 2;
      if (x % 2) num += n / 2;
    } else {
      if (x % 2) num += n / 2 + n % 2;
    }
    num += y / 2 + 1;
    cout << num << '\n';
  }
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  solve();
  return 0;
}
