#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define REP(i,n) for(int i=0,_n=(int)(n);i<_n;++i)
#define ALL(v) (v).begin(),(v).end()
#define CLR(t,v) memset(t,(v),sizeof(t))
template<class T1,class T2>ostream& operator<<(ostream& os,const pair<T1,T2>&a){return os<<"("<<a.first<<","<<a.second<< ")";}
template<class T>void pv(T a,T b){for(T i=a;i!=b;++i)cout<<(*i)<<" ";cout<<endl;}
template<class T>void chmin(T&a,const T&b){if(a>b)a=b;}
template<class T>void chmax(T&a,const T&b){if(a<b)a=b;}

ll nextLong() { ll x; scanf("%lld", &x); return x;}

const int MAX_N = 212345;
vector<int> g[MAX_N];
vector<int> r[MAX_N];

int sccid[MAX_N];
int sccnum;
void dfs(int p, vector<int>& order) {
  if (sccid[p] != 0) return;
  sccid[p] = 1;
  for (int i : g[p]) dfs(i, order);
  order.push_back(p);
}
void rdfs(int p, int id) {
  if (sccid[p] != -1) return;
  sccid[p] = id;
  for (int i : r[p]) rdfs(i, id);
}
void scc(int N) {
  vector<int> order;
  CLR(sccid, 0);
  REP(i, N) dfs(i, order);
  CLR(sccid, -1);
  sccnum = 0;
  for (int i = (int)order.size() - 1; i >= 0; i--) if (sccid[order[i]] == -1) {
    rdfs(order[i], sccnum);
    sccnum++;
  }
}


// 座標圧縮
vector<ll> rev; // 圧縮後の値から元の値への写像
vector<int> normalize(const vector<ll> v) {
  const int N = v.size();
  vector<int> res(N);
  vector<pair<ll,int> > t(N);
  rev = vector<ll>(N);
  REP(i, N) t[i] = { v[i], i };
  sort(ALL(t));
  int r = 0;
  REP(i, N) {
    r += (i > 0 && t[i - 1].first != t[i].first);
    res[t[i].second] = r;
    rev[r] = t[i].first;
  }
  rev.erase(rev.begin() + r + 1, rev.end());
  return res;
}

int main2() {

  REP(i, MAX_N) g[i].clear();
  REP(i, MAX_N) r[i].clear();

  int N = nextLong();
  int M = nextLong();

  vector<ll> es_row(2 * M);
  REP(i, M) {
    int a = nextLong();
    int b = nextLong();
    es_row[2 * i    ] = a;
    es_row[2 * i + 1] = b;
  }
  auto es = normalize(es_row);
  // pv(ALL(rev));

  ll ans = (ll)(N+1)*N/2;
  for (auto x : set<ll>(ALL(es_row))) {
    ans -= x;
  }

  REP(i, M) {
    int a = es[i * 2];
    int b = es[i * 2 + 1];
    g[a].push_back(b);
    r[b].push_back(a);
  }

  int V = rev.size();
  scc(V);

  vector<vector<int>> gg(sccnum);
  vector<int> scc_size(sccnum);
  vector<ll> scc_max(sccnum);
  REP(i, V) {
    scc_size[sccid[i]]++;
    for (int j : g[i]) {
      if (sccid[i] != sccid[j])
        gg[sccid[i]].push_back(sccid[j]);
    }
    chmax(scc_max[sccid[i]], rev[i]);
  }
  REP(s, sccnum) {
    sort(ALL(gg[s]));
    gg[s].erase(unique(ALL(gg[s])), gg[s].end());
    // cout << s << " : "; pv(ALL(gg[s]));
  }

  // cout << "size: "; pv(ALL(scc_size));
  // cout << "max:  "; pv(ALL(scc_max));

  for (int s = sccnum - 1; s >= 0; s--) {
    for (int nxt : gg[s]) {
      chmax(scc_max[s], scc_max[nxt]);
    }
    ans += scc_max[s] * scc_size[s];
  }

  cout << ans << endl;
  return 0;
}

int main() {

#ifdef LOCAL
  for (;!cin.eof();cin>>ws)
#endif
    main2();
  return 0;
}