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// Potyczki20201B.cpp
#include <iostream>
#include <string.h>
#include <fstream>
#include <time.h>
#define DEBUG false

using namespace std;

struct Puszka {
    bool colors[4] = {};
};

int task2() {
    int n, m;
    cin >> n >> m;
    Puszka *arr = new Puszka[n];

    for (size_t i = 0; i < m; i++)
    {
        int l, r, k;
        cin >> l >> r >> k;
        for (; l <= r; l++)
        {
            arr[l].colors[k] = true;
        }
    }

    int sum = 0;
    for (size_t i = 0; i < n; i++)
    {
        if (arr[i].colors[1] && arr[i].colors[2] && !arr[i].colors[3]) sum++;
    }

    delete[] arr;

    return sum;
}

int main()
{
    cout << task2();
}