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#include <iostream>
#include <vector>

int main()
{
    std::ios_base::sync_with_stdio(false);
    int n, m;
    std::cin>>n>>m;
    std::vector<std::vector<short>> startColorsInTans(n);
    std::vector<std::vector<short>> stopColorsInTans(n);
    for(int i=0; i<m; ++i)
    {
       int l, r, c;
       std::cin>>l>>r>>c;
       startColorsInTans[l-1].push_back(c);
       stopColorsInTans[r-1].push_back(c);
    }
    int yellow_ =0, blue_=0, red_=0, count=0;
    for(int i=0; i<n; ++i)
    {
        for(const auto& colorInTan : startColorsInTans[i])
        {
            switch(colorInTan)
            {
                case 1: ++yellow_; break;
                case 2: ++blue_; break;
                case 3: ++red_; break;
            }
        }

        if(yellow_ > 0 and blue_ > 0 and red_ == 0 ) ++count;

        for(const auto& colorInTan : stopColorsInTans[i])
        {
            switch(colorInTan)
            {
                case 1: --yellow_; break;
                case 2: --blue_; break;
                case 3: --red_; break;
            }
        }
    }
    std::cout<<count<<std::endl;
    return 0;
}