N = int(input())
count = 0

l = []
for i in range(N):
    a,b,c = map(int,input().split())
    l.append((a,b,c))
    
for j in range(N):
    for k in range(j+1,N):
        diff = [abs(l[j][m]-l[k][m])for m in range(3)]
        if max(diff)<=5 and sum(diff)<=10:
            count += 1
print(count)

我仔仔细细地看了但是不知道为什么错，特别特别感谢每位评论帮助我的人