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#1
f = open("27-A(2).txt", 'r')
n = int(f.readline())
nums = []
for i in range(n):
    nums.append(int(f.readline()))
f.close()
ans = 0
for i in range(n):
    for j in range(i + 1, n):
        mult = nums[i] * nums[j]
        if mult % (10 ** 6) == 0 and mult % (10 ** 7) != 0:
            ans += 1
print(ans)

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

#3
f = open('27-45782A.txt')
n, k = map(int, f.readline().split())
nums = []
for i in range(n):
    nums.append(int(f.readline()))
f.close()
ans = 0
for i in range(n):
    for j in range(i + 2 * k, n + 1):
        leftsum = sum(nums[i : i + k])
        rightsum = sum(nums[j - k : j])
        allsum = leftsum + rightsum
        if allsum % 68 == 0:
            ans = max(ans, allsum)
print(ans)

#5
f = open('27-45786A.txt')
n, m = map(int, f.readline().split())
a = [int(f.readline()) for x in range(n)]
f.close()
ans = 0
for l in range(0, n):
    for r in range(l + 1, n + 1):
        s = sum(a[l : r])
        if s > m:
            break
        ans = max(ans, r - l)
print(ans)

#6
f = open('27-45788A.txt')
n = int(f.readline())
a = [int(f.readline()) for i in range(n)]
f.close()
ans = 0
for i in range(0, n):
    for j in range(i + 17, n):
        for k in range(j + 17, n):
            ans += int((a[i] + a[j] + a[k]) % 7717 == 0)
print(ans)

#7
f = open('27-45790A.txt')
n = int(f.readline())
a = [int(f.readline()) for i in range(n)]
f.close()
ans = 0
for i in range(0, n):
    for j in range(i + 25, n):
        summ = a[i] + a[j]
        mult = a[i] * a[j]
        ans += int(summ % 4 == 0 and mult % 9009 == 0)
print(ans)

#8
inf = 1000000007
f = open('27A_6638.txt')
n = int(f.readline())
koord = []
packs = []
for i in range(n):
    a, b = map(int, f.readline().split())
    koord.append(a)
    packs.append(b)
f.close()
summin = inf
ans = -1
for i in range(n):
    summ = 0
    for j in range(n):
        summ += packs[j] * abs(koord[j] - koord[i])
    if summ < summin:
        summin = summ
        ans = koord[i]
print(ans, summin)

#4
def Check(x, koord, m):
    for el in koord:
        if abs(el - x) < m:
            return 0
    return 1


inf = 1000000007
f = open('27-45784A.txt')
n, k, m = map(int, f.readline().split())
koord = []
letters = []
for i in range(n):
    a, b = map(int, f.readline().split())
    koord.append(a)
    letters.append(b)
f.close()
summin = inf
ans = -1
for i in range(k):
    if (Check(i, koord, m)):
        summ = 0
        for j in range(n):
            summ += (letters[j] + 19) // 20 * min(abs(koord[j] - i), k - i + koord[j])
        if summ < summin:
            summin = summ
            ans = i
print(summin)

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