#include <bits/stdc++.h>
using namespace std;

#define rep(i, m, n) for(int(i) = (int)(m); i < (int)(n); ++i)
#define rep2(i, m, n) for(int(i) = (int)(n)-1; i >= (int)(m); --i)
#define REP(i, n) rep(i, 0, n)
#define REP2(i, n) rep2(i, 0, n)
#define all(hoge) (hoge).begin(), (hoge).end()
#define en '\n'
using ll = long long;
using ull = unsigned long long;
template <class T>
using vec = vector<T>;
template <class T>
using vvec = vector<vec<T>>;
typedef pair<ll, ll> P;
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;
constexpr long long MOD = 998244353LL;
using ld = long double;
static const ld pi = 3.141592653589793L;
typedef vector<ll> Array;
typedef vector<Array> Matrix;

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;
}

//グラフ関連
struct Edge {
    ll to, cap, rev;
    Edge(ll _to, ll _cap, ll _rev) {
        to = _to;
        cap = _cap;
        rev = _rev;
    }
};
typedef vector<Edge> Edges;
typedef vector<Edges> Graph;

void add_edge(Graph &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));
}

template <typename T, typename E, typename F, typename G, typename H, typename P>
class LazySegmentTree {
  private:
    const T identity_t;
    const E identity_e;
    F f_tt;
    G f_te;
    H f_ee;
    P f_ep; //区間に比例する場合
    vector<T> dat;
    vector<E> lazy;
    int n;
    void eval(int k, int len) {
        if(lazy[k] == identity_e)
            return;
        if(k < n - 1) {
            lazy[2 * k + 1] = f_ee(lazy[2 * k + 1], lazy[k]);
            lazy[2 * k + 2] = f_ee(lazy[2 * k + 2], lazy[k]);
        }
        dat[k] = f_te(dat[k], f_ep(lazy[k], len));
        lazy[k] = identity_e;
    }
    void update(int a, int b, E x, int k, int l, int r) {
        eval(k, r - l);
        if(a <= l && r <= b) {
            lazy[k] = f_ee(lazy[k], x);
            eval(k, r - l);
        } else if(a < r && l < b) {
            update(a, b, x, k * 2 + 1, l, (l + r) / 2);
            update(a, b, x, k * 2 + 2, (l + r) / 2, r);
            dat[k] = f_tt(dat[2 * k + 1], dat[2 * k + 2]);
        }
    }
    T query(int a, int b, int k, int l, int r) {
        eval(k, r - l);
        if(r <= a || b <= l)
            return identity_t;
        else if(a <= l && r <= b)
            return dat[k];
        else {
            T vl = query(a, b, 2 * k + 1, l, (l + r) / 2);
            T vr = query(a, b, 2 * k + 2, (l + r) / 2, r);
            return f_tt(vl, vr);
        }
    }

  public:
    LazySegmentTree(vector<T> v, T id_t, E id_e, F f, G g, H h, P p) : identity_t(id_t), identity_e(id_e), f_tt(f), f_te(g), f_ee(h), f_ep(p) {
        n = 1;
        while(n < v.size())
            n *= 2;
        dat.resize(2 * n - 1, identity_t);
        lazy.resize(2 * n - 1, identity_e);
        REP(i, v.size())
        dat[n + i - 1] = v[i];
        for(int i = n - 2; i >= 0; i--)
            dat[i] = f_tt(dat[i * 2 + 1], dat[i * 2 + 2]);
    }
    void update(int a, int b, E x) { update(a, b, x, 0, 0, n); }
    T query(int a, int b) { return query(a, b, 0, 0, n); }
};

void solve() {

    ll n, q;
    cin >> n >> q;

    ll id_t = n - 1,
       id_e = n - 1;
    auto f = [](ll a, ll b) { return min(a, b); };
    auto g = [](ll a, ll b) { return min(a, b); };
    auto h = [](ll a, ll b) { return min(a, b); };
    auto p = [](ll a, ll b) { return a; };
    LazySegmentTree<ll, ll, decltype(f), decltype(g), decltype(h), decltype(p)> segx(Array(n + 1, n - 1), id_t, id_e, f, g, h, p);
    LazySegmentTree<ll, ll, decltype(f), decltype(g), decltype(h), decltype(p)> segy(Array(n + 1, n - 1), id_t, id_e, f, g, h, p);

    ll ans = (n - 2) * (n - 2);

    while(q--) {
        ll t, x;
        cin >> t >> x;
        x--;
        if(t == 1) {
            ll mi = segx.query(x, x + 1);
            ans -= mi - 1;
            segy.update(0, mi, x);
        } else {
            ll mi = segy.query(x, x + 1);
            ans -= mi - 1;
            segx.update(0, mi, x);
        }
        //cout << ans << en;
    }
    cout << ans << en;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    /*
    ll t;
    cin >> t;
    while(t--)*/
    solve();

    return 0;
}


Measured memory_bytes: 21304