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#include<bits/stdc++.h>

using namespace std;
vector<pair<int, int>> v[1000007];
int n, m;
int cnt[7];
int res = 0;
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int l, r, k;
    cin >>n>>m;
    for (int i=0; i<m; i++){
        cin >> l >> r >>k;
        v[l].push_back(make_pair(r, k));
    }

    for (int i=1; i<=n; i++){
        for (auto rk : v[i]){
            cnt[rk.second] = max(cnt[rk.second], rk.first);
        }
        if (cnt[1]>=i && cnt[2]>= i && cnt[3]< i )
            res++;
    }

    cout <<res<<"\n";
}