#Медленный способ
file = open('7A.txt')
A = list(map(int, file.readlines()))
n = A[0]
A = A[1:]
count = 0
for i in range(n):
     for j in range(i + 1, n):
          if abs(A[i] - A[j]) % 69 == 0:
               count += 1
print(count)

#Статический способ
file = open('7B.txt')
A = list(map(int, file.readlines()))
n = A[0]
A = A[1:]
k = [0] * 69
for i in range(n):
     ost = A[i] % 69
     k[ost] += 1
count = 0
for i in range(0, 69):
     count += k[i] * (k[i] - 1) // 2
print(count)

#Динамичсекий способ
file = open('7B.txt')
A = list(map(int, file.readlines()))
n = A[0]
A = A[1:]
k = [0] * 69
count = 0
for i in range(n):
     ost = A[i] % 69
     count += k[ost]
     k[ost] += 1
print(count)