/*** author: yuji9511 ***/
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using lpair = pair<ll, ll>;
const ll MOD = 1e9+7;
const ll INF = 1e18;
#define rep(i,m,n) for(ll i=(m);i<(n);i++)
#define rrep(i,m,n) for(ll i=(m);i>=(n);i--)
#define printa(x,n) for(ll i=0;i<n;i++){cout<<(x[i])<<" \n"[i==n-1];};
void print() {}
template <class H,class... T>
void print(H&& h, T&&... t){cout<<h<<" \n"[sizeof...(t)==0];print(forward<T>(t)...);}
#define debug(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << "\n"
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(INF) {}

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

        void init_empty() {
            max_v = smax_v = -INF;
            min_v = smin_v = INF;
            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 != INF && 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 != INF && lval < x) {
                lval = x;
            }
        }

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

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

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

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

        void push() {

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

    ll n, n0;
    Node *root;

    void _update_min(ll x, ll a, ll b, Node *nd, ll l, ll 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, ll a, ll b, Node *nd, ll l, ll 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, ll a, ll b, Node *nd, ll l, ll 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, ll a, ll b, Node *nd, ll l, ll 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(ll a, ll b, Node *nd, ll l, ll r) {
        if(b <= l || r <= a) {
            return -INF;
        }
        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(ll a, ll b, Node *nd, ll l, ll r) {
        if(b <= l || r <= a) {
            return INF;
        }
        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(ll a, ll b, Node *nd, ll l, ll 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(ll n, ll *a) : n(n) {
        n0 = 1;
        while(n0 < n) n0 <<= 1;

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

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

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

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

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

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

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

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

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

void solve(){
    ll N,Q;
    cin >> N >> Q;
    ll v[200010] = {};
    rep(i,0,N){
        v[i] = N-1;
    }
    SegmentTree sg_tate(N, v), sg_yoko(N, v);

    ll black = (N-2) * (N-2);
    while(Q--){
        ll t,x;
        cin >> t >> x;
        x--;
        if(t == 1){
            ll min_val = sg_tate.query_sum(x, x+1);
            black -= min_val - 1;
            sg_yoko.update_min(1, min_val, x);
        }else{
            ll min_val = sg_yoko.query_sum(x,x+1);
            black -= min_val-1;
            sg_tate.update_min(1, min_val, x);

        }
    }
    print(black);

    

}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    solve();
}

Measured memory_bytes: 103508