N, M = map(int, input().split())
n = N - 1
pp = set()
mm = set()
ans = 0
for _ in range(M):
    x, y = map(int, input().split())
    x -= 1
    y -= 1
    p = x + y
    m = x - y
    if p not in pp:
        pp.add(p)
        ans += N - abs(p - n)
    if m not in mm:
        mm.add(m)
        ans += N - abs(m)

pp = sorted(pp)
mm = sorted(mm)
pp = sorted([n - abs(n - a) for a in pp])
mm = sorted([abs(a) for a in mm])
SS = sorted(set(pp + mm))
IA = {a: i for i, a in enumerate(SS)}
pp = [IA[a] for a in pp]
mm = [IA[a] for a in mm]
C = [0] * (len(SS) + 2)
for a in mm:
    C[a] += 1
for i in range(len(SS)):
    C[i+2] += C[i]

for a in pp:
    ans -= C[a]
print(ans)