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#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define PB push_back
#define mp make_pair
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using ll = long long;
constexpr int maxn = 1e6+9;
int r[maxn], y[maxn], b[maxn];
int main()
{
    fastio
    int n, m, left, right, ktory;
    cin>>n>>m;
    ///1->y, 2->b, 3->r
    while(m--){
        cin>>left>>right>>ktory;
        if(ktory==1){
            y[left]++;
            y[right+1]--;
        }
        else if(ktory==2){
            b[left]++;
            b[right+1]--;
        }
        else{
            r[left]++;
            r[right+1]--;
        }
    }
    int liczr=0, liczb=0, liczy=0, wyn=0;
    for(int i=1; i<=n; ++i){
        liczr+=r[i];
        liczb+=b[i];
        liczy+=y[i];
        if((liczr==0) && (liczy>=1) && (liczb>=1)){
            wyn++;
        }
    }
    cout<<wyn;
    return 0;
}