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#include <iostream>
#include <stdio.h>

int main() {
    
    long long int n, m;
    scanf("%lld %lld", &n, &m);
    char puszki[n][4] = {{0}};

    long long int l, r;
    int k;

    for (long long i = 0; i<m; i++){
        scanf("%lld %lld %d", &l, &r, &k);
        for(long long j = l; j<=r; j++){
            puszki[j][k] = 1;
        }
    }

    long long int sum = 0;
    for (long long i = 0; i<n; i++){
        if(puszki[i][1] && puszki[i][2] && !puszki[i][3]){
            sum++;
        }
    }
    printf("%lld", sum);

    return 0;
}