first = int(input());

syo = int(first/6);
amari = int(first%6);

result = ""

if syo > 0:
	for num in range(syo):
		result = result + "142857"
elif first ==0:
	result = result + "0"


if amari == 1:
	result = result + "1"

if amari == 2:
	result = result + "14"

if amari == 3:
	result = result + "142"

if amari == 4:
	result = result + "1428"

if amari == 5:
	result = result + "14285"

if first > 0:
	result = "0."+result

print(result)