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#include <iostream>
#include <vector>

using namespace std;

struct colors {
    bool used_colors[3] = { false }; //0 - żółty, 1 - niebieski, 2 - czerwony
};

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n, m; cin >> n >> m;
    vector<colors> fence(n);

    int l, r, color;
    for (int i = 0; i < m; i++) {
        cin >> l >> r;
        l--;
        r--;
        cin >> color;
        color--;
        for (int j = l; j <= r; j++) {
            fence[j].used_colors[color] = true;
        }
    }

    int greens = 0;
    for (int i = 0; i < n; i++) {
        if (fence[i].used_colors[0] && fence[i].used_colors[1] && !fence[i].used_colors[2]) greens++;
    }

    cout << greens;

    return 0;
}