#include <algorithm>
#include <bitset>
#include <climits>
#include <cmath>
#include <cstdio>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <unordered_map>
#include <vector>

#define MOD 1000000007
#define MOD2 998244353
#define int long long
#define double long double
#define EPS 1e-9
//#define PI 3.14159265358979

#define rep(i, n) for (int i = 0; i < (int)(n); i++)

using namespace std;

template < typename T >
ostream &operator<<(ostream &os, const vector< T > &A) {
	for (int i = 0; i < A.size(); i++)
		os << A[i] << " ";
	os << endl;
	return os;
}
template <>
ostream &operator<<(ostream &os, const vector< vector< int > > &A) {
	int N = A.size();
	for (int i = 0; i < N; i++) {
		for (int j = 0; j < A[i].size(); j++)
			os << A[i][j] << " ";
		os << endl;
	}
	return os;
}
template < typename T, typename U >
ostream &operator<<(ostream &os, const pair< T, U > &p) {
	os << "(" << p.first << "," << p.second << ")";
	return os;
}

typedef pair< int, int > pii;
typedef long long ll;

struct edge {
	int from, to, d, c, i;
	edge(int _from = 0, int _to = 0, int _d = 0, int _c = 0) {
		from = _from;
		to = _to;
		d = _d;
		c = _c;
	}
	bool operator<(const edge &rhs) const {
		return (d == rhs.d) ? (c < rhs.c) : (d < rhs.d);
	}
};
struct aabb {
	int x1, y1, x2, y2;
	aabb(int x1, int y1, int x2, int y2) : x1(x1), y1(y1), x2(x2), y2(y2) {}
};

typedef vector< edge > edges;
typedef vector< edges > graph;
struct flow {
	int to, cap, rev, cost;
	flow(int to = 0, int cap = 0, int rev = 0, int cost = 0) : to(to), cap(cap), rev(rev), cost(cost) {}
};
typedef vector< vector< flow > > flows;

const int di[4] = {0, -1, 0, 1};
const int dj[4] = {-1, 0, 1, 0};
const int ci[5] = {0, 0, -1, 0, 1};
const int cj[5] = {0, -1, 0, 1, 0};
const ll LINF = LLONG_MAX / 2;
const int INF = INT_MAX / 2;
const double PI = acos(-1);

int pow2(int n) { return 1LL << n; }
template < typename T, typename U >
bool chmin(T &x, const U &y) {
	if (x > y) {
		x = y;
		return true;
	}
	return false;
}
template < typename T, typename U >
bool chmax(T &x, const U &y) {
	if (x < y) {
		x = y;
		return true;
	}
	return false;
}

template < typename A, size_t N, typename T >
void Fill(A (&array)[N], const T &val) {
	fill((T *)array, (T *)(array + N), val);
}
struct initializer {
	initializer() {
		cout << fixed << setprecision(20);
	}
};
initializer _____;
template < class Monoid, class Action >
struct LSegT {
	int N;
	vector< Monoid > node;
	vector< Action > lazy;
	Monoid UNITY_MONOID = 0; //to be set------------------------
	Action UNITY_ACTION = 0; //to be set------------------------
	Monoid merge(const Monoid &l, const Monoid &r) {
		//to be set---------------------------------
		return l + r;
		//return;
	}
	LSegT(vector< Monoid > &A) {
		int sz = A.size();
		N = 1;
		while (N < sz)
			N <<= 1;
		node.resize(2 * N - 1);
		lazy.resize(2 * N - 1, 0);
		rep(i, sz) node[i + N - 1] = A[i];
		for (int i = N - 2; i >= 0; i--)
			node[i] = merge(node[i * 2 + 1], node[i * 2 + 2]);
	}
	void reflect(int k, int l, int r) {
		//to be set----------------------------------------
		node[k] += lazy[k];
	}
	void add(Action &d, const Action &e) {
		//to be set---------------------------------------
		d += e;
	}
	void eval(int k, int l, int r) {
		if (lazy[k] != UNITY_ACTION) {
			reflect(k, l, r);
			if (r - l > 1) {

				//add(lazy[2 * k + 1], lazy[k]);
				//add(lazy[2 * k + 2], lazy[k]);
				//if p,use this
				add(lazy[2 * k + 1], lazy[k] / 2);
				add(lazy[2 * k + 2], lazy[k] / 2);
			}
			lazy[k] = UNITY_ACTION;
		}
	}
	void set(int a, int b, Action x, int k = 0, int l = 0, int r = -1) {
		if (r < 0)
			r = N;
		if (b <= l || r <= a)
			eval(k, l, r);
		else if (a <= l && r <= b) {
			//add(lazy[k], x);
			//if p,use this
			add(lazy[k], (r - l) * x);
			//eval(k, l, r);
		} else {
			eval(k, l, r);
			set(a, b, x, 2 * k + 1, l, (l + r) / 2);
			set(a, b, x, 2 * k + 2, (l + r) / 2, r);
			node[k] = merge(node[2 * k + 1], node[2 * k + 2]);
		}
	}
	Monoid get(int a, int b, int k = 0, int l = 0, int r = -1) {
		if (r < 0)
			r = N;
		if (b <= l || r <= a)
			return UNITY_MONOID;
		eval(k, l, r);
		if (a <= l && r <= b)
			return node[k];
		Monoid vl = get(a, b, 2 * k + 1, l, (l + r) / 2);
		Monoid vr = get(a, b, 2 * k + 2, (l + r) / 2, r);
		return node[k] = merge(vl, vr);
	}
};
int N, M, K, T, Q, H, W;
signed main() {
	cin >> N >> Q;
	vector< pii > qs(Q);
	rep(i, Q) cin >> qs[i].first >> qs[i].second;
	int ans = (N - 2) * (N - 2);
	vector< int > tmp(N + 10, N);
	LSegT< int, int >
		sgt1(tmp), sgt2(tmp);
	for (auto qr : qs) {
		int q, x;
		tie(q, x) = qr;
		int y;
		int tmp;
		if (q == 1) {
			y = sgt1.get(x, x + 1);
			ans -= y - 2;
			tmp = sgt2.get(1, 2);
			if (sgt2.get(1, 2) > x)
				sgt2.set(1, y, x - tmp);
		} else {
			y = sgt2.get(x, x + 1);
			ans -= y - 2;
			tmp = sgt1.get(1, 2);
			if (sgt1.get(1, 2) > x)
				sgt1.set(1, y, x - tmp);
		}
		//cerr << y << endl;
	}
	cout << ans << endl;
	return 0;
}

Measured memory_bytes: 24328