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#include <iostream>
 
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    int* col = new (nothrow) int[n];
    for(int i = 0; i < n; i++)
        col[i] = 0;

   
    for(int i = 0; i < m; i++)
    {
        int l, r, k;
        cin >> l >> r >> k;
        if(k == 3)
            k = 4;
        for(int j = l-1; j <= r-1; j++)
        {
            col[j] |= k;
        }
    }

    int count = 0;
    for(int i = 0; i < n; i++)
        if(col[i] == 3)
            count++;

    cout << count;
    delete[] col;

    return 0;
}