zxcghoul

#1

import sys

sys.stdin=open('27-A(2).txt')

k=0

n=int(input())

a = [int(input()) for _ in range((n))]

for i in range(n):

    for j in range(i+1, n):

        s=str(a[i]*a[j])

        if s[-7]!='0' and s[-6:] == '000000':

            k+=1

print(k)