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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)

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