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#1
f=open('27-A(2).txt','r')
n=int(f.readline())
a=[]
for i in range(1,n+1):
    a.append(int(f.readline()))

w=0
for i in range(n):
    for j in range(i+1,n):
        x=a[i]
        y=a[j]
        z=x*y
        k=0
        while z%10 ==0:
            k+=1
            z=z//10
        if k == 6:
            w+=1
print(w)

#2
f=open('27-45792A.txt','r')
n=int(f.readline())
a=[]
for i in range(1,n+1):
    a.append(int(f.readline()))

w=0
k=0
for i in range(n):
    for j in range(i+1,n):
        x=a[i]
        y=a[j]
        z=x*y
        c=x+y
        if z%2310 ==0 and c%11 ==0:
            k+=1
w=k
print(w)

#3
f=open('27-45782A.txt','r')
p=str(f.readline())
n,k=map(int,p.split())
print(n,k)
a=[]
for i in range(1,n+1):
    a.append(int(f.readline()))
s=0
s1=0
for i in range(n-2*k):
    for j in range(i+k+1,n-k):
        q=sum(a[i:i+k])
        w=sum(a[j:j+k])
        s1=q +w
        if s1 %68==0 and s1> s:
            s=s1
print(s)

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