from collections import Counter

def Cletki(x, y, s, n):
    s[x+n*y]+=1
    if(x-1>=0):
        if(y+2<n):
            s[x-1+n*(y+2)]+=1

    if(x-1>=0):
        if(y-2>=0):
            s[x-1+n*(y-2)]+=1

    if(x+1<n):
        if(y+2<n):
            s[x+1+n*(y+2)]+=1

    if(x+1<n):
        if(y-2>=0):
            s[x+1+n*(y-2)]+=1

    if(y-1>=0):
        if(x+2<n):
            s[x+2+n*(y-1)]+=1

    if(y-1>=0):
        if(x-2>=0):
            s[x-2+n*(y-1)]+=1

    if(y+1<n):
        if(x+2<n):
            s[x+2+n*(y+1)]+=1

    if(y+1<n):
        if(x-2>=0):
            s[x-2+n*(y+1)]+=1

n, m = map(int,input().split())
l = Counter()

for i in range(m):

    x, y = map(int,input().split())
    Cletki(x-1, y-1, l, n)
print(n**2 - len(list(l)))