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v = [int(i) for i in open('27-A(2).txt')]
n=v[0]
c=0
for i in range(1,n):
    for j in range (i+1,n+1):
        if (v[i]*v[j])%1000000==0 and (v[i]*v[j])%10000000!=0:
            c+=1
print(c)

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