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#1
file = open('27-A(2).txt','r')
v=[]
sum_pair=0
n = int(file.readline())

for s in range(n):
    v.append(int(file.readline()))

for i in range(n):
    a = v[i]
    for j in range(i+1,n):
        b=v[j]
        proisv = a*b
        if proisv%(10**6) == 0 and proisv%(10**7)!=0:
            sum_pair+=1
print(sum_pair)

#2
file = open('27-45792A.txt','r')
v=[]
sum_pair=0
n = int(file.readline())

for s in range(n):
    v.append(int(file.readline()))

for i in range(n):
    a = v[i]
    for j in range(i+1,n):
        b=v[j]
        proisv = a*b
        summa = a+b
        if summa%11 == 0 and proisv%2310 == 0:
            sum_pair+=1
print(sum_pair)

#3
file = open('27-45782A.txt')
v=[]
max_summa = 0
n,k = map(int,file.readline().split())

for s in range(n):
    v.append(int(file.readline()))

for i in range(n - 2*k):
    sum_a = sum(v[i:i+k+1])
    for j in range(i+k, n - k):
        sum_b = sum(v[j:j+k+1])
        summa = sum_a + sum_b
        if summa % 68 == 0:
            if summa > max_summa:
                max_summa = summa
        
print(max_summa)

#5
file = open('27-45786A.txt')
n,m = map(int,file.readline().split())
v = []
for s in file:
    v. append(int(file.readline()))
max_kol_vo = 0
for i in range(n):
    summa = v[i]
    j = i + 1
    while summa <= m:
        if j < n:
            summa += v[j]
            j+=1
        else:
            break
    if summa > m and j < n:
        summa -= v[j]
        j = j - 1
    if max_kol_vo < j - i:
        max_kol_vo = j - i
print(max_kol_vo)

#6
file = open('27-45788A.txt')
n = int(file.readline())
v = []
for s in range(n):
    v. append(int(file.readline()))
kol_vo = 0
for i in range(n):
    a = v[i]
    for j in range(i + 17, n):
        b = v[j]
        for z in range(j + 17, n):
            c = v[z]
            summa = a + b + c
            if summa %  7717 == 0:
                kol_vo+=1
print(kol_vo)

#7
file = open('27-45790A.txt')
n = int(file.readline())
v = []
for i in range(n):
    v. append(int(file.readline()))
kol_vo = 0
for i in range(n):
    a = v[i]
    for j in range(i+25,n):
        b = v[j]
        summa = a + b
        proisv = a * b
        if summa % 4 == 0 and proisv % 9009 == 0:
            kol_vo +=1
print(kol_vo)

#8
file = open('27A_6638.txt')
n = int(file.readline())
v = [[0 for j in range(2)] for i in range(n)]
for i in range(n):
    v[i][0], v[i][1] = map(int,file.readline().split())
min_num = 0
for i in range(n):
    summa = 0
    for j in range(n):
        summa += abs(v[j][0]-v[i][0])*v[j][1]
    if i == 0:
        min_sum = summa
        min_num = v[i][0]
    if summa == min_sum and v[i][0] < min_num:
        min_num = v[i][0]
    if summa < min_sum:
        min_sum = summa
        min_num = v[i][0]
print(min_num, min_sum)

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