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#include<bits/stdc++.h>
using namespace std;
#define magiczne ios_base::sync_with_stdio(0);
#define linijki cin.tie(0);
int n, m, l, r, k, red, yellow, blue, dye[1000007][3], result;
int main()
{
    magiczne linijki
    for (cin >> n >> m; m--;)
    {
        cin >> l >> r >> k;
        dye[--l][--k]++;
        dye[r][k]--;
    }
    for (int i = 0; i < n; ++i)
    {
        yellow += dye[i][0];
        blue += dye[i][1];
        red += dye[i][2];
        if (yellow && blue && !red) result++;
    }
    cout << result;
    return 0;
}