894 B | 894 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def f(a, b, c, n):
return a * n * n + b * n + c
def solve():
d = [0] * 220
ans = 0
n, m = mii()
l = [mii() for _ in range(m)]
for a, b, c in l:
d[f(a, b, c, n)] = 1
dx = [1,-1,0,0,0,0]
dy = [0,0,1,-1,0,0]
dz = [0,0,0,0,1,-1]
for a, b, c in l:
cnt = 0
for i in range(6):
_a, _b, _c = a + dx[i], b + dy[i], c+ dz[i]
if _a < 1 or _b < 1 or _c < 1 or _a > n or _b > n or _c > n:
continue
cnt += d[f(_a, _b, _c, n)]
if cnt == 6:
ans += 1
p(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
solve()