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#include <iostream>
#include <map>
#include <memory>

#ifdef DEBUG
#define DEBUG_LOG(x) do { \
	std::cerr << x << std::endl;\
} while (0)
#else
#define DEBUG_LOG(x) do { \
} while (0)
#endif

using Color_t = uint8_t;
Color_t const k_white = 0;
Color_t const k_yellow = 1;	//001
Color_t const k_blue = 2;	//010
Color_t const k_green = 3;	//011
Color_t const k_red = 4;	//100
Color_t const k_orange = 5;	//101
Color_t const k_violet = 6;	//110
Color_t const k_brown= 7;	//111

std::map<Color_t, std::string> k_colMap = {
	{k_white, "white"},
	{k_yellow, "yellow"},
	{k_blue, "blue"},
	{k_green, "green"},
	{k_red, "red"},
	{k_orange, "orange"},
	{k_violet, "violet"},
	{k_brown, "brown"}
};


Color_t  MixColors(Color_t c1, Color_t c2)
{
	return c1 | c2;
}


struct Range_t
{
	uint64_t start;
	uint64_t len;
	Color_t color;
	Range_t(uint64_t s = 0, uint64_t l = 0, Color_t c = k_white)
		: start(s)
		, len(l)
		, color(c)
	{}
	
	friend std::ostream& operator<<(std::ostream& stream, Range_t const& r)
	{

		stream <<  r.start  << ", ";
		stream << r.len  << ", ";
		stream << k_colMap[r.color];
		return stream;
	}

	uint64_t GetEnd() const
	{
		return start + len;
	}
};

using RangePtr_t = std::unique_ptr<Range_t>;

using RangeMap_t = std::map<uint64_t, RangePtr_t>; 
using RangeMapIt_t = RangeMap_t::iterator; 

RangePtr_t MakeRange(uint64_t s = 0, uint64_t l = 0, Color_t c = k_white)
{
	return std::make_unique<Range_t>(s,l,c);
}

class RangeMap
{
public:
	RangeMap() = default;
	RangeMap(RangeMap const& other) = delete;
	virtual ~RangeMap() = default;

	void UpdatePreviousWhenIntersected_(
		RangeMapIt_t& prev, 
		RangeMapIt_t& curr,
		uint64_t pStart,
		uint64_t pEnd,
		uint64_t cStart,
		uint64_t cEnd)
	{
		Color_t cColor = curr->second->color;
		Color_t pColor = prev->second->color;
		Color_t mix = MixColors(cColor, pColor);
	
		if (cEnd > pEnd)
		{
			curr->second->color = mix;
			curr->second->len = pEnd - cStart;
			Insert_(MakeRange(pEnd, cEnd-pEnd, cColor));
		}
		else if (pEnd > cEnd)
		{
			curr->second->color = mix;
			curr->second->len = cEnd - cStart;
			Insert_(MakeRange(cEnd, pEnd-cEnd, pColor));
		}
		else
		{
			curr->second->color = mix;
			curr->second->len = cEnd - cStart;	
		}
		prev->second->len = cStart - pStart;
	}

	void UpdatePrevious_(RangeMapIt_t& prev, RangeMapIt_t& curr)
	{
		uint64_t pStart = prev->second->start;
		uint64_t pEnd = prev->second->GetEnd();
		uint64_t cStart = curr->second->start;
		uint64_t cEnd = curr->second->GetEnd();

		if (cStart >= pEnd)
		{
			return;
		}
		else
		{
			UpdatePreviousWhenIntersected_(
				prev, curr, pStart, pEnd, cStart, cEnd);
		}
	}
	void UpdateExisting_(RangeMapIt_t& ex, RangePtr_t && curr)
	{
		uint64_t eEnd = ex->second->GetEnd();
		uint64_t cEnd = curr->GetEnd();
		Color_t mix = MixColors(ex->second->color, curr->color);
		if (cEnd > eEnd)
		{
			curr->start = eEnd;
			curr->len = cEnd - eEnd;
			Insert_(std::move(curr));
		}
		else if (eEnd > cEnd)
		{
			curr->start = cEnd;
			curr->len = eEnd - cEnd;
			curr->color = ex->second->color;
			Insert_(std::move(curr));
		}
		ex->second->color = mix;
	}
	
	void Insert(RangePtr_t && range)
	{
		Insert_(std::move(range));
	}

	void Insert_(RangePtr_t && range)
	{
		auto backup = MakeRange(range->start, range->len, range->color);
		auto insRes = ranges.emplace(range->start, std::move(range));
		if (insRes.second)
		{
			if (insRes.first != std::begin(ranges))
			{
				auto prev = std::prev(insRes.first);
				UpdatePrevious_(prev, insRes.first);
			}
			auto next = std::next(insRes.first);
			if (next != std::end(ranges))
			{
				UpdatePrevious_(insRes.first, next);
			}

		}
		else 
		{
			UpdateExisting_(insRes.first, std::move(backup));
		}
	}

	uint64_t GetGreen()
	{
		uint64_t result = 0;
		for(auto const& el : ranges)
		{
			if (el.second->color == k_green)
			{
				result += el.second->len;
			}
		}
		return result;
	}

	friend std::ostream& operator<<(std::ostream& stream, RangeMap const& rm)
	{
		for (auto const& elem : rm.ranges)
		{
			stream << "{"<< elem.first << ": {" << *(elem.second) << "}\n";
		}
		return stream;

	}
private:
	RangeMap_t ranges{};
};

Color_t IntToColor(uint64_t c)
{
	if (c == 1)
		return k_yellow;
	if (c == 2)
		return k_blue;
	if (c == 3)
		return k_red;
	return k_white;
}

void Run(std::istream& input, std::ostream& output)
{
	uint64_t total = 0;
	uint64_t number = 0;
	RangeMap rm{};
	input >> total;
	input >> number;
	for (uint64_t i = 0; i < number; i++)
	{
		uint64_t start = 0;
		uint64_t end = 0;
		uint64_t color=0;

		input >> start;
		input >> end;
		input >> color;
		--start;
		rm.Insert(MakeRange(start, end-start, IntToColor(color)));
	}
	output << rm.GetGreen() << std::endl;
}


#ifndef DEBUG
int main(int argc, char* argv[])
#else
int main_(int argc, char* argv[])
#endif
{
	::Run(std::cin, std::cout);
	return 0;
}