local n = io.read("*n")
if n < 4000 then
  local m = 0
  local c = 0
  for i = 2015, n do
    if i % 400 == 0 then
      m = m + 2
    elseif i % 100 == 0 then
      m = m + 1
    elseif i % 4 == 0 then
      m = m + 2
    else
      m = m + 1
    end
    m = m % 7
    if m == 0 then c = c + 1 end
  end
  print(c)
  os.exit()
end
local m = 0
local c = 0
for i = 2015, 2414 do
  if i % 400 == 0 then
    m = m + 2
  elseif i % 100 == 0 then
    m = m + 1
  elseif i % 4 == 0 then
    m = m + 2
  else
    m = m + 1
  end
  m = m % 7
  if m == 0 then c = c + 1 end
end
local rep = math.floor((n - 2014) / 400)
c = c * rep
local rem = n - rep * 400
for i = 2015, rem do
  if i % 400 == 0 then
    m = m + 2
  elseif i % 100 == 0 then
    m = m + 1
  elseif i % 4 == 0 then
    m = m + 2
  else
    m = m + 1
  end
  m = m % 7
  if m == 0 then c = c + 1 end
end
print(c)