n = gets.chomp.to_i
ans = 1
mod = 10**12
flag = false
for i in 1..n
  if ans * i >= mod
    flag = true
  end
  ans = ans * i % mod
  if ans == 0
    puts "000000000000"
    exit(0)
  end
end
s = ans.to_s
if flag
  while s.length < 12
    s = "0" + s
  end
end
puts s