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#include <iostream>
#include <set>
#include <vector>

using namespace std;

int main() {
    int cansNum, specOperations, leftIndex, rightIndex, colour;
    cin >> cansNum;
    cin >> specOperations;
    vector<set<int>> cans(cansNum);
    for (int i = 0; i < specOperations; i++) {
        cin >> leftIndex >> rightIndex >> colour;
        for (int j = leftIndex; j <= rightIndex; j++) {
            cans[j - 1].insert(colour);
        }
    }
    int greenPaint = 0;
    for (auto& can : cans) {
        if (can.size() == 2 && can.find(2) != can.end() && can.find(1) != can.end()) {
            greenPaint++;
        }
    }
    cout << greenPaint;
    return 0;
}