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#include <iostream>

using namespace std;

int main()
{
    int n,m;
    cin >> n;
    cin >> m;
    int a,b,c;
    int counter = 0;
    int tab[n] = {0};

    int x = sizeof(tab)/sizeof(tab[0]);


     for(int i = 0; i<m; i++)
     {
         cin>>a;
         cin>>b;
         cin>>c;
         for(int j = a-1; j <= b-1; j++)
         {
             switch(tab[j])
             {
             case 0:
                tab[j] = c;
                break;
             case 1:
                if(c == 2)
                {
                    tab[j] = 4;
                }
                else if(c == 1)
                {

                }
                else if(c == 3)
                {
                    tab[j] = 9;
                }
                break;
             case 2:
                if (c == 1)
                {
                    tab[j] = 4;
                }
                else if(c == 2)
                {

                }
                else if(c == 3)
                {
                    tab[j] = 9;
                }
                break;
             case 3:
                if(c == 3)
                {

                }
                else if(c == 1 || c == 2)
                {
                    tab[j] = 9;
                }
                break;
             case 4:
             if(c == 1 || c == 2)
                {

                }
                else if(c == 3)
                {
                    tab[j] = 9;
                }
                break;
             }

         }

    /*     for(int g = 0; g < x; g++)
         {
             if(tab[g] == 0)
             {
                 cout<<"Kolory: Biala |";
             }
             if(tab[g] == 1)
             {
                 cout<<"Kolory: Zolta |";
             }
             if(tab[g] == 2)
             {
                 cout<<"Kolory: Niebieska |";
             }
             if(tab[g] == 3)
             {
                 cout<<"Kolory: Czerwona |";
             }
             if(tab[g] == 4)
             {
                 cout<<"Kolory: Zielona |";
             }
             if(tab[g] == 9)
             {
                 cout<<"Kolory: Inne |";
             }
             //cout<<"Kolory: "<<tab[g]<<" ";
         }
         cout<<endl;
*/
     }




     for(int i = 0; i < x; i++)
     {

         //cout<<"Kolory: "<<tab[i]<<" ";
         if(tab[i] == 4)
         {
             counter++;
         }
     }
     cout<<counter;
     //cout<<"Dlugosc: "<<x;


    return 0;
}