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#include <bits/stdc++.h>
using namespace std;

int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
	int ile_zielonych=0;
	int n, m; cin>>n>>m;
	int puszki[n]={};
	int l, r, k;
	for(int i=1; i<=m; ++i){
		cin>>l>>r>>k;
		for(int j=l; j<=r; ++j){
			if(k==1){
				if(puszki[j-1]==0){
					puszki[j-1]=1;
					continue;
				}
				if(puszki[j-1]==2){
					puszki[j-1]=4;
					continue;
				}
				if(puszki[j-1]==3){
					puszki[j-1]=5;
					continue;
				}
				if(puszki[j-1]==6){
					puszki[j-1]=7;
					continue;
				}
			}
			
			if(k==2){
				if(puszki[j-1]==0){
					puszki[j-1]=2;
					continue;
				}
				if(puszki[j-1]==1){
					puszki[j-1]=4;
					continue;
				}
				if(puszki[j-1]==3){
					puszki[j-1]=6;
					continue;
				}
				if(puszki[j-1]==5){
					puszki[j-1]=7;
					continue;
				}
			}
			
			if(k==3){
				if(puszki[j-1]==0){
					puszki[j-1]=3;
					continue;
				}
				if(puszki[j-1]==1){
					puszki[j-1]=5;
					continue;
				}
				if(puszki[j-1]==2){
					puszki[j-1]=6;
					continue;
				}
				if(puszki[j-1]==4){
					puszki[j-1]=7;
					continue;
				}
			}
			
		}
	}
	
	for(int i=0; i<n; ++i){
		if(puszki[i]==4) ++ile_zielonych;
	}
	
	cout<<ile_zielonych<<"\n";
	
	return 0;
}