x = gets.to_i
cnt = 0
one = 1.to_f
ans = 0 
if x==2 
    ans = 10 ** 6
end
if x != 2 
    for i in 1..10000
	key = one / (i ** x) 
	cnt += ((1 / i) - key) * (one / (i - 1))
    end
    ans = cnt * (10 ** 6)
end


print(ans.floor)