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27

count = 0; mas = []
file = open("27-A(2).txt")
n = int(file.readline().rstrip())
for line in file:
    mas.append(int(line.rstrip()))

for i in range(n):
    for j in range(i + 1, n):
        if mas[i] * mas[j] % 1000000 == 0 and mas[i] * mas[j] % 10000000 != 0:
            count += 1

print(count)
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