/**
 *	author: nok0
 *	created: 2020.09.20 12:58:42
**/
#ifdef LOCAL
#define _GLIBCXX_DEBUG
#endif
#include<bits/stdc++.h>
using namespace std;
#pragma region Macros
#define ll long long
#define ld long double
#define FOR(i,l,r) for(int i=(l);i<(r);++i)
#define REP(i,n) FOR(i,0,n)
#define REPS(i,n) FOR(i,1,n+1)
#define RFOR(i,l,r) for(int i=(l);i>=(r);--i)
#define RREP(i,n) RFOR(i,n-1,0)
#define RREPS(i,n) RFOR(i,n,1)
#define pb push_back
#define eb emplace_back
#define SZ(x) ((int)(x).size())
#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()
template<class T = int> using V = vector<T>;
template<class T = int> using VV = V<V<T>>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
#define VEC(type, name, size)\
    V<type> name(size);\
    IN(name)
#define VVEC(type, name, h, w)\
    VV<type> name(h, V<type>(w));\
    IN(name)
#define INT(...)\
    int __VA_ARGS__;\
    IN(__VA_ARGS__)
#define LL(...)\
    ll __VA_ARGS__;\
    IN(__VA_ARGS__)
#define STR(...)\
    string __VA_ARGS__;\
    IN(__VA_ARGS__)
#define CHAR(...)\
    char __VA_ARGS__;\
    IN(__VA_ARGS__)
#define DOUBLE(...)\
    DOUBLE __VA_ARGS__;\
    IN(__VA_ARGS__)
#define LD(...)\
    LD __VA_ARGS__;\
    IN(__VA_ARGS__)
void scan(int &a) { cin >> a; }
void scan(long long &a) { cin >> a; }
void scan(char &a) { cin >> a; }
void scan(double &a) { cin >> a; }
void scan(long double &a) { cin >> a; }
void scan(char a[]) { scanf("%s", a); }
void scan(string &a) { cin >> a; }
template <class T> void scan(V<T> &);
template <class T, class L> void scan(pair<T, L> &);
template <class T> void scan(V<T> &a) { for(auto &i : a) scan(i); }
template <class T, class L> void scan(pair<T, L> &p){ scan(p.first); scan(p.second); }
template <class T> void scan(T &a) { cin >> a; }
void IN() {}
template <class Head, class... Tail> void IN(Head &head, Tail &... tail) { scan(head); IN(tail...); }
template <class T> inline void print(T x){ cout << x << '\n';}
template <typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p){
    is >> p.first >> p.second;
    return is;
}
template <typename T1, typename T2>
ostream &operator<<(ostream &os, const pair<T1, T2> &p){
    os << p.first << " " << p.second;
    return os;
}
template <class T>
ostream &operator<<(ostream &os, const V<T> &v){
    REP(i, SZ(v)){
        if(i) os << " ";
        os << v[i];
    }
    return os;
}
//debug
template <typename T>
void view(const V<T> &v){
    cerr << "{ ";
    for(const auto &e : v){
        cerr << e << ", ";
    }
    cerr << "\b\b }";
}
template <typename T>
void view(const VV<T> &vv){
    cerr << "{\n";
    for(const auto &v : vv){
        cerr << "\t";
        view(v);
        cerr << "\n";
    }
    cerr << "}";
}
template <typename T, typename U>
void view(const V<pair<T, U>> &v){
    cerr << "{\n";
    for(const auto &c : v) cerr << "\t(" << c.first << ", " << c.second << ")\n";
    cerr << "}";
}
template <typename T, typename U>
void view(const map<T, U> &m){
    cerr << "{\n";
    for(auto &t : m) cerr << "\t[" << t.first << "] : " << t.second << "\n";
    cerr << "}";
}
template <typename T, typename U>
void view(const pair<T, U> &p){ cerr << "(" << p.first << ", " << p.second << ")";}
template <typename T>
void view(const set<T> &s) {
    cerr << "{ ";
    for(auto &t : s) {
        view(t);
        cerr << ", ";
    }
    cerr << "\b\b }";
}
template <typename T>
void view(T e) { cerr << e;}
#ifdef LOCAL
void debug_out() {}
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    view(H);
    cerr << ", ";
    debug_out(T...);
}
#define debug(...)                                           \
    do{                                                     \
        cerr << __LINE__ << " [" << #__VA_ARGS__ << "] : ["; \
        debug_out(__VA_ARGS__);                              \
        cerr << "\b\b]\n";                                   \
    } while(0)
#else
#define debug(...) (void(0))
#endif
template <class T> V<T> press(V<T> &x){ 
    V<T> res = x;
    sort(all(res));
    res.erase(unique(all(res)), res.end());
    REP(i, SZ(x)){
        x[i] = lower_bound(all(res), x[i]) - res.begin();
    }
    return res;
}
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; }
inline void Yes(bool b = true) {cout << (b ? "Yes" : "No") << '\n';}
inline void YES(bool b = true) {cout << (b ? "YES" : "NO") << '\n';}
inline void err(bool b = true) {if(b) {cout << -1 << '\n'; exit(0);}}
template<class T> inline void fin(bool b = true, T e = 0) {if(b) {cout << e << '\n'; exit(0);}}
template<class T> T divup(T x, T y) {return (x+(y-1))/y;}
template <typename T> T pow(T a, long long n, T e = 1) {T ret = e; while (n) {if (n & 1) ret *= a; a *= a; n >>= 1; } return ret; }
struct iofast{iofast(){ios::sync_with_stdio(false); cin.tie(nullptr); cout << fixed << setprecision(15);}}iofast_;
const int inf = 1e9;
const ll INF = 1e18;
#pragma endregion

template <class T>
struct SegmentTreeBeats{
private:
    size_t n, n_;
    const T MAX = std::numeric_limits<T>::max();
    const T MIN = -MAX;
    std::vector<T> max_v, min_v, smax_v, smin_v, lz_upd, lz_ad, sigm, len;
    std::vector<int> max_c, min_c;

    void init(std::vector<T> &v){
        n_ = v.size(), n = 1;
        while(n < n_) n *= 2;
        max_v.assign(n * 2 - 1, MIN);
        min_v.assign(n * 2 - 1, MAX);
        smax_v.assign(n * 2 - 1, MIN);
        smin_v.assign(n * 2 - 1, MAX);
        lz_upd.assign(n * 2 - 1, MAX);
        lz_ad.assign(n * 2 - 1, 0);
        len.assign(n * 2 - 1, n);
        sigm.assign(n * 2 - 1, 0);
        max_c.assign(n * 2 - 1, 1);
        min_c.assign(n * 2 - 1, 1);

        for(int i = 0; i < n - 1; i++)
            len[i * 2 + 1] = len[i * 2 + 2] = (len[i] >> 1);

        for(int i = 0; i < n_; i++)
            max_v[i + n - 1] = min_v[i + n - 1] = sigm[i + n - 1] = v[i];
        
        for(int i = n - 2; i >= 0; i--)
            proc(i);
    }
    
    void proc(int i){
        sigm[i] = sigm[i * 2 + 1] + sigm[i * 2 + 2];

        max_v[i] = std::max(max_v[i * 2 + 1], max_v[i * 2 + 2]);

        if(max_v[i * 2 + 1] > max_v[i * 2 + 2]){
            max_c[i] = max_c[i * 2 + 1];
            smax_v[i] = std::max(smax_v[i * 2 + 1], max_v[i * 2 + 2]);
        }

        if(max_v[i * 2 + 1] < max_v[i * 2 + 2]){
            max_c[i] = max_c[i * 2 + 2];
            smax_v[i] = std::max(max_v[i * 2 + 1], smax_v[i * 2 + 2]);
        }

        if(max_v[i * 2 + 1] == max_v[i * 2 + 2]){
            max_c[i] = max_c[i * 2 + 1] + max_c[i * 2 + 2];
            smax_v[i] = std::max(smax_v[i * 2 + 1], smax_v[i * 2 + 2]);
        }

        min_v[i] = std::min(min_v[i * 2 + 1], min_v[i * 2 + 2]);

        if(min_v[i * 2 + 1] < min_v[i * 2 + 2]){
            min_c[i] = min_c[i * 2 + 1];
            smin_v[i] = std::min(smin_v[i * 2 + 1], min_v[i * 2 + 2]);
        }

        if(min_v[i * 2 + 1] > min_v[i * 2 + 2]){
            min_c[i] = min_c[i * 2 + 2];
            smin_v[i] = std::min(min_v[i * 2 + 1], smin_v[i * 2 + 2]);
        }

        if(min_v[i * 2 + 1] == min_v[i * 2 + 2]){
            min_c[i] = min_c[i * 2 + 1] + min_c[i * 2 + 2];
            smin_v[i] = std::min(smin_v[i * 2 + 1], smin_v[i * 2 + 2]);
        }
    }
    
    void eval(int i){
        if(lz_upd[i] != MAX){
            in_update(i * 2 + 1, lz_upd[i]);
            in_update(i * 2 + 2, lz_upd[i]);
            lz_upd[i] = MAX;
            return;
        }

        if(lz_ad[i]){
            in_add(i * 2 + 1, lz_ad[i]);
            in_add(i * 2 + 2, lz_ad[i]);
            lz_ad[i] = 0;
        }

        if(max_v[i] < max_v[i * 2 + 1]) in_chmin(i * 2 + 1, max_v[i]);
        if(max_v[i] < max_v[i * 2 + 2]) in_chmin(i * 2 + 2, max_v[i]);

        if(min_v[i] > min_v[i * 2 + 1]) in_chmax(i * 2 + 1, min_v[i]);
        if(min_v[i] > min_v[i * 2 + 2]) in_chmax(i * 2 + 2, min_v[i]);
    }

    void in_update(int i, T x){
        max_v[i] = min_v[i] = x;
        smax_v[i] = MIN, smin_v[i] = MAX;
        max_c[i] = min_c[i] = len[i];
        sigm[i] = len[i] * x;
        lz_upd[i] = x, lz_ad[i] = 0;
    }

    void in_chmin(int i, T x){
        sigm[i] += (x - max_v[i]) * max_c[i];
        
        if(max_v[i] == min_v[i])
            max_v[i] = min_v[i] = x;

        else if(max_v[i] == smin_v[i])
            max_v[i] = smin_v[i] = x;

        else max_v[i] = x;

        if(lz_upd[i] != MAX and lz_upd[i] > x) lz_upd[i] = x;
    }

    void in_chmax(int i, T x){
        sigm[i] += (x - min_v[i]) * min_c[i];
        
        if(min_v[i] == max_v[i])
            min_v[i] = max_v[i] = x;

        else if(min_v[i] == smax_v[i])
            min_v[i] = smax_v[i] = x;
        
        else min_v[i] = x;

        if(lz_upd[i] != MAX and lz_upd[i] < x) lz_upd[i] = x;
    }

    void in_add(int i, T x){
        max_v[i] += x, min_v[i] += x;

        if(smin_v[i] != MAX) smin_v[i] += x;
        if(smax_v[i] != MIN) smax_v[i] += x;

        sigm[i] += x * len[i];
        
        if(lz_upd[i] != MAX) lz_upd[i] += x;
        lz_ad[i] += x;
    }

    void chmin(int i, int a, int b, int l, int r, T x){
        if(b <= l or r <= a or x >= max_v[i]) return;

        if(a <= l and r <= b and smax_v[i] < x){
            in_chmin(i, x);
            return;
        }

        eval(i);
        chmin(i * 2 + 1, a, b, l, (l + r) >> 1, x);
        chmin(i * 2 + 2, a, b, (l + r) >> 1, r, x);
        proc(i);
    }

    void chmax(int i, int a, int b, int l, int r, T x){
        if(b <= l or r <= a or x <= min_v[i]) return;

        if(a <= l and r <= b and smin_v[i] > x){
            in_chmax(i, x);
            return;
        }

        eval(i);
        chmax(i * 2 + 1, a, b, l, (l + r) >> 1, x);
        chmax(i * 2 + 2, a, b, (l + r) >> 1, r, x);
        proc(i);
    }

    void add(int i, int a, int b, int l, int r, T x){
        if(b <= l or r <= a) return;

        if(a <= l and r <= b){
            in_add(i, x);
            return;
        }

        eval(i);
        add(i * 2 + 1, a, b, l, (l + r) >> 1, x);
        add(i * 2 + 2, a, b, (l + r) >> 1, r, x);
        proc(i);
    }

    void update(int i, int a, int b, int l, int r, T x){
        if(b <= l or r <= a) return;
        
        if(a <= l and r <= b){
            in_update(i, x);
            return;
        }

        eval(i);
        update(i * 2 + 1, a, b, l, (l + r) >> 1, x);
        update(i * 2 + 2, a, b, (l + r) >> 1, r, x);
        proc(i);
    }

    T sum(int i, int a, int b, int l, int r) {
        if (r <= a || b <= l) return 0;
        if (a <= l && r <= b) return sigm[i];
        eval(i);
        T lv = sum(i * 2 + 1, a, b, l, (l + r) / 2);
        T rv = sum(i * 2 + 2, a, b, (l + r) / 2, r);
        return lv + rv;
    }

    T rangemin(int i, int a, int b, int l, int r){
        if(r <= a or b <= l) return MAX;

        if(a <= l and r <= b) return min_v[i];

        eval(i);

        T lv = rangemin(i * 2 + 1, a, b, l, (l + r) >> 1);
        T rv = rangemin(i * 2 + 2, a, b, (l + r) >> 1, r);
        return std::min(lv, rv);
    }

    T rangemax(int i, int a, int b, int l, int r){
        if(r <= a or b <= l) return MIN;
        
        if(a <= l and r <= b) return max_v[i];

        eval(i);

        T lv = rangemax(i * 2 + 1, a, b, l, (l + r) >> 1);
        T rv = rangemax(i * 2 + 2, a, b, (l + r) >> 1, r);
        return std::max(lv, rv);
    }

    T rangesum(int i, int a, int b, int l, int r){
        if(r <= a or b <= l) return 0;
        
        if(a <= l and r <= b) return sigm[i];

        eval(i);

        T lv = rangesum(i * 2 + 1, a, b, l, (l + r) >> 1);
        T rv = rangesum(i * 2 + 2, a, b, (l + r) >> 1, r);
        return lv + rv;
    }

public:
    SegmentTreeBeats() = default;

    SegmentTreeBeats(std::vector<T> &v){
        init(v);
    }

    SegmentTreeBeats(size_t n, T init_data){
        std::vector<T> v(n, init_data);
        init(v);
    }

    T operator[](int i) {
        return query_min(i, i + 1);
    }

    void update_chmin(int a, int b, T x){
        chmin(0, a, b, 0, n, x);
    }

    void update_chmax(int a, int b, T x){
        chmax(0, a, b, 0, n, x);
    }

    void update_add(int a, int b, T x){
        add(0, a, b, 0, n, x);
    }

    void update_upd(int a, int b, T x){
        update(0, a, b, 0, n, x);
    }

    T query_min(int a, int b){
        return rangemin(0, a, b, 0, n);
    }

    T query_max(int a, int b){
        return rangemax(0, a, b, 0, n);
    }

    T query_sum(int a, int b){
        return rangesum(0, a, b, 0, n);
    }
};

int main(){
    INT(n, q);
    ll res = pow((ll) n - 2, 2);
    V<> a(n, n - 1);
    SegmentTreeBeats<int> width(a), height(a);
    while(q--){
        INT(type, x);
        x--;
        if(type == 1){
            int m = height[x];
            width.update_chmin(0, m, x);
            res -= (--m);
        }
        if(type == 2){
            int m = width[x];
            height.update_chmin(0, m, x);
            res -= (--m);
        }
    }
    print(res);
}

Measured memory_bytes: 45172