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// Andrzej Radzik

#include <iostream>

int main() {
	std::cin.tie(0);
	short array [ 100001 ];
	int n;
	int m;
	int l;
	int r;
	short k;
	int i;
	int j;
	int count = 0;
	
	std:: cin >> n >> m;
	
	for ( i = 1; i <= n; ++i ) {
		array[ i ] = 0;
	}
	
	for ( i = 0; i < m; ++i ) {
		std::cin >> l >> r >> k;
		if ( k == 3 )
			k = 4;

		for ( j = l; j <= r; ++j ) {
			array[ j ] |= k;
		}
	}
	
	for ( i = 1; i <= n; ++i ) {
		if ( array[ i ] == 3 )
			count++;
	}
	
	std::cout << count << std::endl;
	
	return 0;
}