#include "bits/stdc++.h"

//#include <atcoder/all>

using namespace std;
//using namespace atcoder;

#define int long long
#define ll long long

ll INF = (1LL << 60);
int mod = 998244353;
using P = pair<int, int>;
#define N 200010

class SegmentTree {
	const ll inf = 1e18;
	int n, n0;
	ll max_v[4 * N], smax_v[4 * N], max_c[4 * N];
	ll min_v[4 * N], smin_v[4 * N], min_c[4 * N];
	ll sum[4 * N];
	ll len[4 * N], ladd[4 * N], lval[4 * N];

	void update_node_max(int k, ll x) {
		sum[k] += (x - max_v[k]) * max_c[k];

		if (max_v[k] == min_v[k]) {
			max_v[k] = min_v[k] = x;
		}
		else if (max_v[k] == smin_v[k]) {
			max_v[k] = smin_v[k] = x;
		}
		else {
			max_v[k] = x;
		}

		if (lval[k] != inf && x < lval[k]) {
			lval[k] = x;
		}
	}
	void update_node_min(int k, ll x) {
		sum[k] += (x - min_v[k]) * min_c[k];

		if (max_v[k] == min_v[k]) {
			max_v[k] = min_v[k] = x;
		}
		else if (smax_v[k] == min_v[k]) {
			min_v[k] = smax_v[k] = x;
		}
		else {
			min_v[k] = x;
		}

		if (lval[k] != inf && lval[k] < x) {
			lval[k] = x;
		}
	}

	void push(int k) {

		if (n0 - 1 <= k) return;

		if (lval[k] != inf) {
			updateall(2 * k + 1, lval[k]);
			updateall(2 * k + 2, lval[k]);
			lval[k] = inf;
			return;
		}

		if (ladd[k] != 0) {
			addall(2 * k + 1, ladd[k]);
			addall(2 * k + 2, ladd[k]);
			ladd[k] = 0;
		}

		if (max_v[k] < max_v[2 * k + 1]) {
			update_node_max(2 * k + 1, max_v[k]);
		}
		if (min_v[2 * k + 1] < min_v[k]) {
			update_node_min(2 * k + 1, min_v[k]);
		}

		if (max_v[k] < max_v[2 * k + 2]) {
			update_node_max(2 * k + 2, max_v[k]);
		}
		if (min_v[2 * k + 2] < min_v[k]) {
			update_node_min(2 * k + 2, min_v[k]);
		}
	}

	void update(int k) {
		sum[k] = sum[2 * k + 1] + sum[2 * k + 2];

		if (max_v[2 * k + 1] < max_v[2 * k + 2]) {
			max_v[k] = max_v[2 * k + 2];
			max_c[k] = max_c[2 * k + 2];
			smax_v[k] = max(max_v[2 * k + 1], smax_v[2 * k + 2]);
		}
		else if (max_v[2 * k + 1] > max_v[2 * k + 2]) {
			max_v[k] = max_v[2 * k + 1];
			max_c[k] = max_c[2 * k + 1];
			smax_v[k] = max(smax_v[2 * k + 1], max_v[2 * k + 2]);
		}
		else {
			max_v[k] = max_v[2 * k + 1];
			max_c[k] = max_c[2 * k + 1] + max_c[2 * k + 2];
			smax_v[k] = max(smax_v[2 * k + 1], smax_v[2 * k + 2]);
		}

		if (min_v[2 * k + 1] < min_v[2 * k + 2]) {
			min_v[k] = min_v[2 * k + 1];
			min_c[k] = min_c[2 * k + 1];
			smin_v[k] = min(smin_v[2 * k + 1], min_v[2 * k + 2]);
		}
		else if (min_v[2 * k + 1] > min_v[2 * k + 2]) {
			min_v[k] = min_v[2 * k + 2];
			min_c[k] = min_c[2 * k + 2];
			smin_v[k] = min(min_v[2 * k + 1], smin_v[2 * k + 2]);
		}
		else {
			min_v[k] = min_v[2 * k + 1];
			min_c[k] = min_c[2 * k + 1] + min_c[2 * k + 2];
			smin_v[k] = min(smin_v[2 * k + 1], smin_v[2 * k + 2]);
		}
	}

	void _update_min(ll x, int a, int b, int k, int l, int r) {
		if (b <= l || r <= a || max_v[k] <= x) {
			return;
		}
		if (a <= l && r <= b && smax_v[k] < x) {
			update_node_max(k, x);
			return;
		}

		push(k);
		_update_min(x, a, b, 2 * k + 1, l, (l + r) / 2);
		_update_min(x, a, b, 2 * k + 2, (l + r) / 2, r);
		update(k);
	}

	void _update_max(ll x, int a, int b, int k, int l, int r) {
		if (b <= l || r <= a || x <= min_v[k]) {
			return;
		}
		if (a <= l && r <= b && x < smin_v[k]) {
			update_node_min(k, x);
			return;
		}

		push(k);
		_update_max(x, a, b, 2 * k + 1, l, (l + r) / 2);
		_update_max(x, a, b, 2 * k + 2, (l + r) / 2, r);
		update(k);
	}

	void addall(int k, ll x) {
		max_v[k] += x;
		if (smax_v[k] != -inf) smax_v[k] += x;
		min_v[k] += x;
		if (smin_v[k] != inf) smin_v[k] += x;

		sum[k] += len[k] * x;
		if (lval[k] != inf) {
			lval[k] += x;
		}
		else {
			ladd[k] += x;
		}
	}

	void updateall(int k, ll x) {
		max_v[k] = x; smax_v[k] = -inf;
		min_v[k] = x; smin_v[k] = inf;
		max_c[k] = min_c[k] = len[k];

		sum[k] = x * len[k];
		lval[k] = x; ladd[k] = 0;
	}

	void _add_val(ll x, int a, int b, int k, int l, int r) {
		if (b <= l || r <= a) {
			return;
		}
		if (a <= l && r <= b) {
			addall(k, x);
			return;
		}

		push(k);
		_add_val(x, a, b, 2 * k + 1, l, (l + r) / 2);
		_add_val(x, a, b, 2 * k + 2, (l + r) / 2, r);
		update(k);
	}

	void _update_val(ll x, int a, int b, int k, int l, int r) {
		if (b <= l || r <= a) {
			return;
		}
		if (a <= l && r <= b) {
			updateall(k, x);
			return;
		}

		push(k);
		_update_val(x, a, b, 2 * k + 1, l, (l + r) / 2);
		_update_val(x, a, b, 2 * k + 2, (l + r) / 2, r);
		update(k);
	}

	ll _query_max(int a, int b, int k, int l, int r) {
		if (b <= l || r <= a) {
			return -inf;
		}
		if (a <= l && r <= b) {
			return max_v[k];
		}
		push(k);
		ll lv = _query_max(a, b, 2 * k + 1, l, (l + r) / 2);
		ll rv = _query_max(a, b, 2 * k + 2, (l + r) / 2, r);
		return max(lv, rv);
	}

	ll _query_min(int a, int b, int k, int l, int r) {
		if (b <= l || r <= a) {
			return inf;
		}
		if (a <= l && r <= b) {
			return min_v[k];
		}
		push(k);
		ll lv = _query_min(a, b, 2 * k + 1, l, (l + r) / 2);
		ll rv = _query_min(a, b, 2 * k + 2, (l + r) / 2, r);
		return min(lv, rv);
	}

	ll _query_sum(int a, int b, int k, int l, int r) {
		if (b <= l || r <= a) {
			return 0;
		}
		if (a <= l && r <= b) {
			return sum[k];
		}
		push(k);
		ll lv = _query_sum(a, b, 2 * k + 1, l, (l + r) / 2);
		ll rv = _query_sum(a, b, 2 * k + 2, (l + r) / 2, r);
		return lv + rv;
	}

public:
	SegmentTree(int n) {
		SegmentTree(n, nullptr);
	}

	SegmentTree(int n, ll *a) : n(n) {
		n0 = 1;
		while (n0 < n) n0 <<= 1;

		for (int i = 0; i < 2 * n0; ++i) ladd[i] = 0, lval[i] = inf;
		len[0] = n0;
		for (int i = 0; i < n0 - 1; ++i) len[2 * i + 1] = len[2 * i + 2] = (len[i] >> 1);

		for (int i = 0; i < n; ++i) {
			max_v[n0 - 1 + i] = min_v[n0 - 1 + i] = sum[n0 - 1 + i] = (a != nullptr ? a[i] : 0);
			smax_v[n0 - 1 + i] = -inf;
			smin_v[n0 - 1 + i] = inf;
			max_c[n0 - 1 + i] = min_c[n0 - 1 + i] = 1;
		}

		for (int i = n; i < n0; ++i) {
			max_v[n0 - 1 + i] = smax_v[n0 - 1 + i] = -inf;
			min_v[n0 - 1 + i] = smin_v[n0 - 1 + i] = inf;
			max_c[n0 - 1 + i] = min_c[n0 - 1 + i] = 0;
		}
		for (int i = n0 - 2; i >= 0; i--) {
			update(i);
		}
	}

	// range minimize query
	void update_min(int a, int b, ll x) {
		_update_min(x, a, b, 0, 0, n0);
	}

	// range maximize query
	void update_max(int a, int b, ll x) {
		_update_max(x, a, b, 0, 0, n0);
	}

	// range add query
	void add_val(int a, int b, ll x) {
		_add_val(x, a, b, 0, 0, n0);
	}

	// range update query
	void update_val(int a, int b, ll x) {
		_update_val(x, a, b, 0, 0, n0);
	}

	// range minimum query
	ll query_max(int a, int b) {
		return _query_max(a, b, 0, 0, n0);
	}

	// range maximum query
	ll query_min(int a, int b) {
		return _query_min(a, b, 0, 0, n0);
	}

	// range sum query
	ll query_sum(int a, int b) {
		return _query_sum(a, b, 0, 0, n0);
	}
};
int n, q;
int a[200010];
signed main() {
	cin >> n >> q;
	for (int i = 0; i < n; i++) {
		a[i] = n - 1;
	}
	SegmentTree q1(n, a), q2(n, a);
	int ans = (n - 2)*(n - 2);
	for (int i = 0; i < q; i++) {
		int ty, x; cin >> ty >> x; x--;
		if (ty == 1) {
			int now = q2.query_min(x, x + 1);
			ans -= now - 1;
			q1.update_min(1, now, x);
		}
		else {
			int now = q1.query_min(x, x + 1);
			ans -= now - 1;
			q2.update_min(1, now, x);
		}
	}
	cout << ans << endl;
	return 0;
}


Measured memory_bytes: 86256