#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long ll;
typedef pair<ll,ll> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<typename T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
const ll MOD=998244353;
const ll LINF=1ll<<60;
const int INF=1<<30;
int dx[]={1,0,-1,0,1,-1,1,-1};
int dy[]={0,1,0,-1,1,-1,-1,1};



// Segment Tree Beats
// - l<=i<r について、 A_i の値を min(A_i, x) に更新
// - l<=i<r について、 A_i の値を max(A_i, x) に更新
// - l<=i<r の中の A_i の最大値を求める
// - l<=i<r の中の A_i の最小値を求める
// - l<=i<r の A_i の和を求める
// - l<=i<r について、 A_i の値に x を加える
// - l<=i<r について、 A_i の値を x に更新

class SegmentTree {
    struct Node {
        Node *left, *right;
        ll max_v, smax_v, max_c;
        ll min_v, smin_v, min_c;
        ll sum;
        ll len, ladd, lval;

        Node() : left(0), right(0), ladd(0), lval(LINF) {}

        void init(ll x) {
            max_v = min_v = sum = x;
            smax_v = -LINF; smin_v = LINF;
            max_c = min_c = 1;
        }

        void init_empty() {
            max_v = smax_v = -LINF;
            min_v = smin_v = LINF;
            max_c = min_c = 0;
        }

        void update_max(ll x) {
            sum += (x - max_v) * max_c;

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

            if(lval != LINF && x < lval) {
                lval = x;
            }
        }

        void update_min(ll x) {
            sum += (x - min_v) * min_c;

            if(max_v == min_v) {
                max_v = min_v = x;
            } else if(max_v == smin_v) {
                min_v = smax_v = x;
            } else {
                min_v = x;
            }

            if(lval != LINF && lval < x) {
                lval = x;
            }
        }

        void addall(ll x) {
            max_v += x;
            if(smax_v != -LINF) smax_v += x;
            min_v += x;
            if(smin_v != LINF) smin_v += x;

            sum += len * x;
            if(lval != LINF) {
                lval += x;
            } else {
                ladd += x;
            }
        }

        void updateall(ll x) {
            max_v = min_v = x;
            smax_v = -LINF; smin_v = LINF;
            max_c = min_c = len;

            sum = len * x;
            lval = x; ladd = 0;
        }

        void push() {

            if(lval != LINF) {
                left->updateall(lval);
                right->updateall(lval);
                lval = LINF;
                return;
            }

            if(ladd != 0) {
                left->addall(ladd);
                right->addall(ladd);
                ladd = 0;
            }

            if(max_v < left->max_v) {
                left->update_max(max_v);
            }
            if(left->min_v < min_v) {
                left->update_min(min_v);
            }

            if(max_v < right->max_v) {
                right->update_max(max_v);
            }
            if(right->min_v < min_v) {
                right->update_min(min_v);
            }
        }

        void update() {
            sum = left->sum + right->sum;

            if(left->max_v < right->max_v) {
                max_v = right->max_v;
                max_c = right->max_c;
                smax_v = max(left->max_v, right->smax_v);
            } else if(left->max_v > right->max_v) {
                max_v = left->max_v;
                max_c = left->max_c;
                smax_v = max(left->smax_v, right->max_v);
            } else {
                max_v = left->max_v;
                max_c = left->max_c + right->max_c;
                smax_v = max(left->smax_v, right->smax_v);
            }

            if(left->min_v < right->min_v) {
                min_v = left->min_v;
                min_c = left->min_c;
                smin_v = min(left->smin_v, right->min_v);
            } else if(left->min_v > right->min_v) {
                min_v = right->min_v;
                min_c = right->min_c;
                smin_v = min(left->min_v, right->smin_v);
            } else {
                min_v = left->min_v;
                min_c = left->min_c + right->min_c;
                smin_v = min(left->smin_v, right->smin_v);
            }
        }
    };

    int n, n0;
    Node *root;

    void _update_min(ll x, int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a || nd->max_v <= x) {
            return;
        }
        if(a <= l && r <= b && nd->smax_v < x) {
            nd->update_max(x);
            return;
        }

        nd->push();
        _update_min(x, a, b, nd->left, l, (l+r)/2);
        _update_min(x, a, b, nd->right, (l+r)/2, r);
        nd->update();
    }

    void _update_max(ll x, int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a || x <= nd->min_v) {
            return;
        }
        if(a <= l && r <= b && x < nd->smin_v) {
            nd->update_min(x);
            return;
        }

        nd->push();
        _update_max(x, a, b, nd->left, l, (l+r)/2);
        _update_max(x, a, b, nd->right, (l+r)/2, r);
        nd->update();
    }

    void _add_val(ll x, int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a) {
            return;
        }
        if(a <= l && r <= b) {
            nd->addall(x);
            return;
        }

        nd->push();
        _add_val(x, a, b, nd->left, l, (l+r)/2);
        _add_val(x, a, b, nd->right, (l+r)/2, r);
        nd->update();
    }

    void _update_val(ll x, int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a) {
            return;
        }
        if(a <= l && r <= b) {
            nd->updateall(x);
            return;
        }

        nd->push();
        _update_val(x, a, b, nd->left, l, (l+r)/2);
        _update_val(x, a, b, nd->right, (l+r)/2, r);
        nd->update();
    }

    ll _query_max(int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a) {
            return -LINF;
        }
        if(a <= l && r <= b) {
            return nd->max_v;
        }
        nd->push();
        ll lv = _query_max(a, b, nd->left, l, (l+r)/2);
        ll rv = _query_max(a, b, nd->right, (l+r)/2, r);
        return max(lv, rv);
    }

    ll _query_min(int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a) {
            return LINF;
        }
        if(a <= l && r <= b) {
            return nd->min_v;
        }
        nd->push();
        ll lv = _query_min(a, b, nd->left, l, (l+r)/2);
        ll rv = _query_min(a, b, nd->right, (l+r)/2, r);
        return min(lv, rv);
    }

    ll _query_sum(int a, int b, Node *nd, int l, int r) {
        if(b <= l || r <= a) {
            return 0;
        }
        if(a <= l && r <= b) {
            return nd->sum;
        }
        nd->push();
        ll lv = _query_sum(a, b, nd->left, l, (l+r)/2);
        ll rv = _query_sum(a, b, nd->right, (l+r)/2, r);
        return lv + rv;
    }

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

        Node *nds = new Node[2*n0];
        root = nds;

        nds[0].len = n0;
        for(int i=0; i<n0-1; ++i) {
            nds[i].left = &nds[2*i+1];
            nds[i].right = &nds[2*i+2];
            nds[2*i+1].len = nds[2*i+2].len = (nds[i].len >> 1);
        }

        for(int i=0; i<n; ++i) nds[n0-1+i].init(a[i]);
        for(int i=n; i<n0; ++i) nds[n0-1+i].init_empty();
        for(int i=n0-2; i>=0; i--) nds[i].update();
    }

    void update_min(int a, int b, ll x) {
        _update_min(x, a, b, root, 0, n0);
    }

    void update_max(int a, int b, ll x) {
        _update_max(x, a, b, root, 0, n0);
    }

    void add_val(int a, int b, ll x) {
        _add_val(x, a, b, root, 0, n0);
    }

    void update_val(int a, int b, ll x) {
        _update_val(x, a, b, root, 0, n0);
    }

    ll query_max(int a, int b) {
        return _query_max(a, b, root, 0, n0);
    }

    ll query_min(int a, int b) {
        return _query_min(a, b, root, 0, n0);
    }

    ll query_sum(int a, int b) {
        return _query_sum(a, b, root, 0, n0);
    }
};

int main(){
    ll n,q;cin >> n >> q;
    ll ans = 0;
    vector<ll> a(n, n - 2);
    SegmentTree segx(n, a);
    SegmentTree segy(n, a);
    while(q--){
        int t,x;cin >> t >> x;
        x--;
        if(t == 1){
            ll p = segx.query_max(x, x + 1);
            ans += p;
            segy.update_min(0, p + 1, x - 1);
        }
        else{
            ll p = segy.query_max(x, x + 1);
            ans += p;
            segx.update_min(0, p + 1, x - 1);
        }
    }
    cout << (n - 2) * (n - 2) - ans << endl;
    return 0;
}


Measured memory_bytes: 104824