1)

s = 0

i = 0

while True:

  a = int(input())

  if a == 0: break

  else:

      i += 1

      s += a

s = s / i

print(s)

2)

i = 0

while True:

  a = int(input())

  if a == 0: break

  elif a == 7: i += 1

print(i)