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#include <cstdint>
#include <cstring>
#include <map>
#include <set>
#include <utility>


using u32 = std::uint32_t;

const u32 MAX = 1e6 + 1u;

/*
  1 - START YELLOW
  2 - START BLUE
  3 - START RED

  4 - END YELLOW
  5 - END BLUE
  6 - END RED
*/

u32 colors[MAX];

int main()
{
    u32 n, m, l, r, k;

    scanf("%u %u", &n, &m);
    for(u32 i=0; i<m; ++i)
    {
        scanf("%u %u %u", &l, &r, &k);
        colors[l] |= 1 << k;
        colors[r] |= 0b1000u << k;
    }

    u32 Y=0, B=0, R=0;
    u32 result = 0;

    for(int i=1; i<MAX; ++i)
    {
        Y += (colors[i] >> 1) & 1u;
        B += (colors[i] >> 2) & 1u;
        R += (colors[i] >> 3) & 1u;

        result += (Y and B and (not R));

        Y -= (colors[i] >> 4) & 1u;
        B -= (colors[i] >> 5) & 1u;
        R -= (colors[i] >> 6) & 1u;
    }

    printf("%u", result);
    return 0;
}