import sys
input=lambda: sys.stdin.readline().rstrip()
n=int(input())
def primes(n):
  is_prime=[True]*(n+1)
  is_prime[0]=False
  is_prime[1]=False
  for i in range(2,int(n**0.5)+1):
    if not is_prime[i]:
      continue
    for j in range(i*2,n+1,i):
      is_prime[j]=False
  return [i for i in range(n+1) if is_prime[i]]
P=primes(10**5+100)
PP=[]
for p in reversed(P):
  if p>10**5:
    PP.append(p)
  else:
    break
PPP=set()
for p1 in PP:
  for p2 in PP:
    PPP.add(p1*p2)
PPP=sorted(list(PPP))
if n==1:
  print(1)
else:
  print(PPP[n-2])