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#include<bits/stdc++.h>

using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n, m;
    cin>>n>>m;
    vector<array<int, 3>> v(n+1);
    for(int i = 0; i <= n; i++){
        v[i][0] = 0; v[i][1] = 0; v[i][2] = 0;
    }
    for(int i = 0; i < m; i++){
        int l, r, k;
        cin>>l>>r>>k;
        v[l-1][k-1]++;
        v[r][k-1]--;
    }
    int yellow = 0;
    int red = 0;
    int blue = 0;
    int result = 0;
    for(int i = 0; i < n; i++){
        yellow += v[i][0];
        blue += v[i][1];
        red += v[i][2];
        if(yellow > 0 && blue > 0 && red == 0)result++;
    }
    cout<<result;
}