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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#define YELLOW_START 0x01
#define YELLOW_END   0x02
#define BLUE_START   0x04
#define BLUE_END     0x08
#define RED_START    0x10
#define RED_END      0x20

int main(void) {
    uint32_t bucketSize, orderSize;
    scanf("%u %u", &bucketSize, &orderSize);
    uint8_t* buckets = (uint8_t*) malloc(sizeof(uint8_t) * bucketSize);
    uint32_t begin, end, colorId, colorFlag;
    while (orderSize--) {
        scanf("%u %u %u", &begin, &end, &colorId);
        switch (colorId) {
            case 1:
                colorFlag = YELLOW_START;
                break;
            case 2:
                colorFlag = BLUE_START;
                break;
            case 3:
                colorFlag = RED_START;
                break;
        }
        buckets[begin-1] |= colorFlag;
        buckets[end-1] |= 2*colorFlag; 
    }
    uint32_t greens = 0;
    uint32_t yellows = 0;
    uint32_t blues = 0;
    uint32_t reds = 0;
    for (uint32_t i = 0; i < bucketSize; ++i) {
        if (buckets[i]) {
            if (buckets[i] & BLUE_START)
                blues++;
            if (buckets[i] & YELLOW_START)
                yellows++;
            if (buckets[i] & RED_START)
                reds++;
        }

        if (yellows && blues && !reds)
            greens++;

        if (buckets[i]) {
            if (buckets[i] & BLUE_END)
                blues--;
            if (buckets[i] & YELLOW_END)
                yellows--;
            if (buckets[i] & RED_END)
                reds--;
        }
    }

    printf("%u", greens);

    free(buckets);
}