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#1

# ����
a = []
with open('27-A.txt') as file:
    a = [int(num) for num in file.readlines()]
n = a[0]
a = a[1:]
# ���������
ans = 0
for i in range(n):
    for j in range(i + 1, n):
        if (a[i] * a[j]) % 10**6 == 0 and (a[i] * a[j]) % 10**7 != 0:
            ans += 1
# �����
print(ans)

#2

# ����
a = []
with open('27-45792A.txt') as file:
    a = [int(num) for num in file.readlines()]
n = a[0]
a = a[1:]
# ���������
ans = 0
for i in range(n):
    for j in range(i + 1, n):
        if (a[i] + a[j]) % 11 == 0 and (a[i] * a[j]) % 2310 == 0:
            ans += 1
# �����
print(ans)

#3

# ����
a = []
with open('27-45782A.txt') as file:
    n, k = map(int, file.readline().split())
    a = [int(num) for num in file.readlines()]
# ���������
ans = 0
for i in range(n):
    for j in range(i + k + 1, n):
        if (sum(a[i:i+k]) + sum(a[j:j+k])) % 68 == 0:
            ans = max(sum(a[i:i+k]) + sum(a[j:j+k]), ans)
# �����
print(ans)

# 5

# ����
a = []
with open('27-45786A.txt', 'r') as f:
    n, m = map(int, f.readline().split())
    a = [int(i) for i in f.readlines()]

ans = -float('inf')

# ���������
for i in range(n):
    ind = i
    s = 0
    while s <= m:
      if ind + 1 >= n:
          break
      s += a[ind]
      if s < m:
          ind += 1
    ans = max(ans, ind - i)

# �����
print(ans)

# 4

# ����
with open('27-45784A.txt', 'r') as f:
    n, k, m = map(int, f.readline().split())
    a = [list(map(int, f.readline().split())) for i in range(n)]

# ���������
ans = float('inf')
for pos in range(1, k + 1):
    dist = [float('inf')] * n
    for i in range(n):
        dist[i] = min(abs(a[i][0] - pos), abs(k + a[i][0] - pos))
    f = True
    for i in range(n):
        if dist[i] < m:
            f = False
            break
    if not f:
        continue
    curr = 0
    for i in range(n):
        curr += dist[i] * (a[i][1] // 20 + (a[i][1] % 20 != 0))
    ans = min(ans, curr)

# �����
print(ans)

# 6

# ����
with open('27-45788A.txt', 'r') as f:
    n = int(f.readline())
    a = [int(i) % 7717 for i in f.readlines()]

# ���������
ans = 0
for i in range(n):
    for j in range(i + 17, n):
      ans += a[j + 17:].count((2 * 7717 - a[i] - a[j]) % 7717)

# �����
print(ans)

# 7

# ����
with open('27-45790A.txt', 'r') as f:
    n = int(f.readline())
    a = [int(num) for num in f.readlines()]

# ���������
ans = 0
for i in range(n):
    for j in range(i + 25, n):
      ans += ((a[i] + a[j]) % 4 == 0) and (a[i] * a[j] % 9009 == 0)

# �����
print(ans)

# 8

# ����
with open('27A_6638.txt', 'r') as f:
    n = int(f.readline())
    a = [list(map(int, i.split())) for i in f.readlines()]

# ���������
ind = 0
ans = float('inf')

for i in range(n):
    s = 0
    for j in range(n):
        s += abs(a[i][0] - a[j][0]) * a[j][1]
    if ans > s:
        ans = s
        ind = a[i][0]

# �����
print(ind, ans)

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