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#include <iostream>
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;

    bool p[n + 1][4] = {};
    int r = 0;

    for (int i = 0; i < m; i++) {
        int l, r, k;
        cin >> l >> r >> k;
        for (int z = l; z <= r; z++) {
            p[z][k] = true;
        }
    }


    for (int i = 0; i <= n; i++) {
        // cout << p[i][1] << " " << p[i][2] << " " << p[i][3] << endl;
        if (p[i][1] && p[i][2] && !p[i][3]) {
            r++;
        }
    }

    cout << r;

    return 0;
}