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#include <bits/stdc++.h>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int n;
    cin >> n;
    vector<int> vec(n + 1);
    int m;
    cin >> m;
    int a, b, k;
    int green = 0;
    for (int i = 0; i < m; i++) {
        cin >> a;
        cin >> b;
        cin >> k;
        for (int j = a; j <= b; j++) {
            if (k == 1) {
                if (vec[j] == 2) {
                    vec[j] = 4;
                    green++;
                } else if (vec[i] == 0) {
                    vec[j] = 1;
                }
            } else if (k == 2) {
                if (vec[j] == 1) {
                    vec[j] = 4;
                    green++;
                } else if (vec[j] == 0) {
                    vec[j] = 2;
                }
            } else if (k == 3) {
                if (vec[j] == 4) {
                    green--;
                }
                vec[j] = 3;
            }
        }
        // cout << "-----------" << endl;
        // for (int j = 1; j <= n; j++) {
        //     cout << vec[j] << endl;
        // }
        // cout << "-----------" << endl;
    }
    cout << green;
    return 0;
}