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#include <iostream>

using namespace std;

int main() 
{
    int n, m;
    cin >> n >> m;
    int puszki[1000000] = {0};
    for(int i = 0; i < m; i++)
    {
        int l, p, c;
        cin >> l >> p >> c;
        for(l; l <= p; l++)
        {
            int p = puszki[l - 1];
            if(p == 0) puszki[l - 1] = c;
            else if(c < p)
            {
                if(c == 1 && p == 6) puszki[l - 1] += c;
                else if(c == 2 && p == 5) puszki[l - 1] += c;
                else if(c == 3 && p == 4) puszki[l - 1] += c;
                else continue; 
            }
            else puszki[l - 1] += c + 1;
        }
    }
    int licz = 0;
    for(int i = 0; i < n; i++)
    {
        if(puszki[i] == 4) licz++;
    }
    cout << licz;

    return 0;
}