1 #include<cstdio>
 2 #include<cstdlib>
 3 #include<algorithm>
 4 #include<cstdlib>
 5 #include<cstring>
 6 //#include<iostream>
 7 using namespace std;
 8 
 9 int n,m;
10 #define maxn 111*2
11 int row[maxn],col[maxn],a[maxn],b[maxn],mp[maxn][maxn];
12 int x,y;
13 int main()
14 {
15     scanf("%d%d",&n,&m);
16     memset(row,0,sizeof(row));
17     memset(col,0,sizeof(col));
18     memset(a,0,sizeof(a));
19     memset(b,0,sizeof(b));
20     memset(mp,0,sizeof(mp));
21     for (int i=1;i<=m;i++)
22     {
23         scanf("%d%d",&x,&y);
24         row[x]++;
25         col[y]++;
26         a[n-y+x]++;
27         b[x+y-1]++;
28         mp[x][y]++;
29     }
30     int ans=0;
31     for (int i=1;i<=n;i++)
32         for (int j=1;j<=n;j++)
33             if (row[i]+col[j]+a[n-j+i]+b[i+j-1]-mp[i][j]*3==m) ans++;
34     printf("%d\n",ans);
35     return 0;
36 }