chess

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
  int n,m;
  cin>>n>>m;
  set<int> used[2];
  for(int i=0;i<m;i++){
    int x,y;
    cin>>x>>y;
    used[0].insert(x + y);
    used[1].insert(x - y);
  }
  int ans = 0;
  for(int x=1;x<=n;x++){
    for(int y=1;y<=n;y++){
      if(used[0].find(x + y) == used[0].end())
        if(used[1].find(x - y) == used[1].end())
          ans++;
    }
  }
  cout<<ans<<endl;
  return 0;
}