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

void counting(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, m, x, y, color;
    cin >> n >> m;
    pair<bool, pair<bool, bool> > tableAll[n];

    for (int i = 0; i < n; i++) {
        tableAll[i] = {false, {false, false}};
    }

    for(int i=0; i<m; ++i){
        cin >> x >> y >> color;
        --x;
        --y;
        for(int j=x; j<=y; ++j){
            if(color == 1){
                tableAll[j].first = true;
            } else if(color == 2){
                tableAll[j].second.first = true;
            } else {
                tableAll[j].second.second = true;
            }
        }
    }

    x=0;
    for (int i=0; i<n; i++){
        if(tableAll[i].first == true && tableAll[i].second.first == true && tableAll[i].second.second == false) ++x;
    }

    cout << x;
}

int main(){
    counting();
    return 0;
}