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#include <bits/stdc++.h>

using namespace std;

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

    int n, m;
    cin >> n >> m;

    vector<vector<int>> sum(n, vector<int>(3, 0));    

    for (int i = 0; i < m; ++i) {
        int l, r, k;
        cin >> l >> r >> k;
        l--, r--, k--;

        sum[l][k]++;
        if (r + 1 < n) {
            sum[r + 1][k]--;
        }
    }

    int res = 0;

    for (int i = 0; i < n; ++i) {
        if (i) {
            for (int j = 0; j < 3; ++j) {
                sum[i][j] += sum[i - 1][j];
            }
        }
        res += sum[i][0] and sum[i][1] and not sum[i][2];
    }

    cout << res << "\n";
}