list=[100003, 100019, 100043, 100049, 100057, 100069, 100103, 100129, 100151, 100153, 100169]
newlist=[]
for i in list:
	for j in list:
		newlist.append(i*j)
newlist.append(1)
newlist.sort()
print(newlist[int(input())-1])