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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define ll long long
#define lll __int128
#define ull unsigned long long
#define fi first
#define se second
#define db double
#define ld long double
#define lld __float128

/// order_of_key, find_by_order

template<class T, class COMP>
using custom_set = tree<T, null_type, COMP, rb_tree_tag, tree_order_statistics_node_update>;

template<class T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

template<class T>
using ordered_multiset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

template<class T, class U>
using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rnd_64(chrono::steady_clock::now().time_since_epoch().count());

const int MAXN = 1000006;

int add[MAXN][3];
int cnt[3];

int main()
{
    int n, m; cin >> n >> m;
    for(int i = 0; i < m; i++)
    {
        int l, r, k; cin >> l >> r >> k; k--;
        l--; add[l][k]++;
        add[r][k]--;
    }
    int ans = 0;
    for(int i = 0; i < n; i++)
    {
        cnt[0] += add[i][0];
        cnt[1] += add[i][1];
        cnt[2] += add[i][2];
        if(cnt[0] && cnt[1] && !cnt[2])
            ans++;
//        cout << ans << ' ';
    }
    cout << ans;
}






































/// shche ne vmerla Ykraina