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#include <iostream>
#include <vector>

using namespace std;

struct color {
    bool yellow;
    bool blue;
    bool red;
};
int main() {
    int n,m;
    cin >> n >> m;
    vector<color> cans(n);
    for(int i = 0;i<m;i++) {
        int l,r,k;
        cin >> l >> r >> k;
        for(int j = l;j<=r;j++) {
            switch (k) {
                case 1:
                    cans[j-1].yellow = true;
                    break;
                case 2:
                    cans[j-1].blue = true;
                    break;
                case 3:
                    cans[j-1].red = true;
            }
        }
    }
    int counter = 0;
    for(int i = 0;i<n;i++) {
        if(cans[i].yellow && cans[i].blue && !cans[i].red) {
            counter++;
        }
    }
    cout << counter << endl;
    return 0;
}