#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define FORR2(x,y,arr) for(auto& [x,y]:arr)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
template<class T> bool chmax(T &a, const T &b) { if(a<b){a=b;return 1;}return 0;}
template<class T> bool chmin(T &a, const T &b) { if(a>b){a=b;return 1;}return 0;}
//-------------------------------------------------------


ll N;
ll M;
set<ll> A,B;

void solve() {
	int i,j,k,l,r,x,y; string s;
	
	cin>>N>>M;
	FOR(i,M) {
		ll X,Y;
		cin>>X>>Y;
		X--,Y--;
		A.insert(X+Y);
		B.insert(X-Y);
	}
	vector<ll> Bs[2];
	
	ll ret=0;
	FORR(v,B) {
		ret+=N-abs(v);
		Bs[abs(v)%2].push_back(v);
	}
	FORR(v,A) {
		if(v<N) {
			ret+=v+1;
			ret-=lower_bound(ALL(Bs[v%2]),v+1)-lower_bound(ALL(Bs[v%2]),-v);
		}
		else {
			ret+=2*N-1-v;
			ll w=2*N-2-v;
			ret-=lower_bound(ALL(Bs[v%2]),w+1)-lower_bound(ALL(Bs[v%2]),-w);
		}
	}
	cout<<ret<<endl;
}


int main(int argc,char** argv){
	string s;int i;
	if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
	FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
	cout.tie(0); solve(); return 0;
}