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#include <bits/stdc++.h>

using namespace std;

int main() 
{
  int tab[1000000][2];
  int n, m;
  int a, b, x;
  scanf("%d %d", &n, &m);

  for (int i = 0; i < m; i++)
  {
    scanf("%d %d %d", &a, &b, &x);

    if (x == 1)
    {
        for (int j = a-1; j<b; j++)
        {
          if (tab[j][0] != 3)
            tab[j][0] = 1;
        }
    }
    else if (x == 2)
    {
        for (int j = a-1; j<b; j++)
        {
          tab[j][1] = 2;
        }
    }
    else 
    {
      for (int j = a-1; j<b; j++)
        {
          tab[j][0] = 3;
        }
    }
  }

  int res = 0;

  for (int i = 0; i < n; i++)
  {
    if (tab[i][0] == 1 && tab[i][1] == 2) res++;
  }

  printf("%d", res);
}