import sys
input = sys.stdin.readline
import bisect

ODD_1=[]
ODD_2=[]
EVEN_1=[]
EVEN_2=[]

ANS=0

def calc1(x):
    if x<N:
        return x+1
    else:
        return N-(x-N+1)

def calc2(x):
    if x>=0:
        return N-x
    else:
        return N+x
    

N,M=map(int,input().split())

for i in range(M):
    x,y=map(int,input().split())
    x-=1
    y-=1

    if (x+y)%2==0:

        u=y+x
        v=x-y

        EVEN_1.append(u)
        EVEN_2.append(v)

    else:

        u=y+x
        v=x-y

        ODD_1.append(u)
        ODD_2.append(v)
            
EVEN_1=sorted(set(sorted(EVEN_1)))
EVEN_2=sorted(set(sorted(EVEN_2)))
ODD_1=sorted(set(sorted(ODD_1)))
ODD_2=sorted(set(sorted(ODD_2)))

ANS=0

for x in ODD_1+EVEN_1:
    ANS+=calc1(x)

for x in ODD_2+EVEN_2:
    ANS+=calc2(x)

# ODD_1でx<Nと交わるのは、ODD_2で-x<=x
# ODD_1でx>=Nと交わるのは、k=x-N+1として、ODD_2で-(x-2*k)<=x-2*k

for x in ODD_1:
    if x<N:
        y=x
    else:
        k=x-N+1
        y=(x-2*k)    
        
    l=bisect.bisect_left(ODD_2,-y)
    r=bisect.bisect_right(ODD_2,y)

    ANS-=r-l

for x in EVEN_1:
    if x<N:
        y=abs(x)
    else:
        k=x-N+1
        y=abs(x-2*k)
        
    l=bisect.bisect_left(EVEN_2,-y)
    r=bisect.bisect_right(EVEN_2,y)

    ANS-=r-l

print(ANS)