from bisect import bisect_left, bisect_right
import sys
input = sys.stdin.readline

n, m = map(int, input().split())
xst = set([]);	yst = set([])
for _ in [0] * m:
	X, Y = map(int, input().split())
	xst.add((X - 1) + (Y - 1))
	yst.add((X - 1) - (Y - 1))

lis = [[] for _ in [0] * 2]
for x in sorted(xst):
	lis[x & 1].append(x)

ans = 0
for x in xst:
	ans += min(x, n - 1) - max(-n + 1 + x, 0) + 1
for y in yst:
	b = abs(y) & 1
	ans += min(n - 1 + y, n - 1) - max(y, 0) + 1
	l = bisect_left(lis[b], max(y, -y))
	r = bisect_right(lis[b], min(2 * (n - 1) - y, 2 * (n - 1) + y))
	ans -= r - l

print(ans)