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#include <iostream>
#include <map>

std::map<int, int> changeC, changeZ, changeN;

int main()
{
    int n, q, C = 0, Z = 0, N = 0, suma = 0;
    std::cin>>n>>q;

    int l, r, k;
    for(int a = 0; a < q; a++){
        std::cin>>l>>r>>k;

        if(k == 1){
            changeZ[l]++;
            changeZ[r+1]--;
        }
        else if(k == 2){
            changeN[l]++;
            changeN[r+1]--;
        }
        else{
            changeC[l]++;
            changeC[r+1]--;
        }
    }

    for(int a = 1; a <= n; a++){
        Z += changeZ[a];
        C += changeC[a];
        N += changeN[a];

        //std::cout<<Z<<" "<<N<<" "<<C<<"\n";
        if(Z >= 1 && N >= 1 && C == 0)
            suma++;
    }
    std::cout<<suma;
}