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#1
def F(n):
    k=0
    while n%10==0:
        k+=1
        n=n//10
    return k
f=open('27-A(1).txt','r')
n=int(f.readline())
a=[int(f.readline()) for _ in range(n)]
f.close()
k=0
for i in range(n-1):
    for j in range(i+1,n):
        if F(a[i]*a[j])==6:
            k+=1
print(k)

#2
f=open('27-45792A.txt','r')
n=int(f.readline())
a=[int(f.readline()) for _ in range(n)]
f.close()
k=0
for i in range(n-1):
    for j in range(i+1,n):
        if (a[i]*a[j])%2310==0 and (a[i]+a[j])%11==0:
            k+=1
print(k)

#3
f=open('27-45782A.txt','r')
n,k=map(int,f.readline().split())
a=[int(f.readline()) for _ in range(n)]
f.close()
m=0
for i in range(n-2*k):
    for j in range(i+k+1,n-k):
        if (sum(a[i:i+k])+sum(a[j:j+k]))%68==0 and (sum(a[i:i+k])+sum(a[j:j+k]))>m:
            m=sum(a[i:i+k])+sum(a[j:j+k])
print(m)

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