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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cout.tie(0);
    cin.tie(0);

    int n, m, l, r, k, ret = 0;
    cin >> n >> m;
    int* tab = new int[n];
    for(int i = 0; i < n; ++i) tab[i] = 0;
    for(int j = 0; j < m; ++j){
        cin >> l >> r >> k;
        l--;
        r--;
        if(k == 3){
            for(int i = l; i <= r; ++i){
                tab[i] = 4;
            }
        }
        else if(k == 1){
            for(int i = l; i <= r; ++i){
                if(tab[i] == 2 || tab[i] == 0) tab[i]+=1;
            }
        }
        else{
            for(int i = l; i <= r; ++i){
                if(tab[i] <= 1) tab[i]+=2;
            }
        }
    }
    for(int i = 0; i < n; ++i){
        if(tab[i] == 3) ret++;
    }
    cout << ret;
}