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#include <iostream>
#include <vector>

int main() {
    int n, m, green = 0;
    std::cin >> n >> m;
    std::vector<int> color;

    while (n--)
        color.push_back(0);

    while (m--)
    {
        int l, r, k;
        std::cin >> l >> r >> k; // k 1-yellow 2-blue 3-red
        while (--r >= l-1)
        {
            if (color[r] == -1)
                continue;

            if (color[r] == 3 && k == 3)
            {
                color[r] = -1;
                green--;
                continue;
            }

            if (color[r] == 3)
                continue;

            if (k == 3)
            {
                color[r] = -1;
                continue;
            }

            if (color[r] == k)
                continue;

            if ( (color[r] == 1 && k == 2) || (color[r] == 2 && k == 1) )
            {
                color[r] = 3;
                green++;
                continue;
            }

            color[r] += k;
        }
    }

    std::cout << green;

    return 0;
}