import sys
input = sys.stdin.readline

x=10**5+100
import math 
L=math.floor(math.sqrt(x)) # 平方根を求める

Primelist=[i for i in range(x+1)]
Primelist[1]=0 # 1は素数でないので0にする.
 
for i in Primelist:
    if i>L:
        break
    if i==0:
        continue
    for j in range(2*i,x+1,i):
        Primelist[j]=0

Primes=[Primelist[j] for j in range(x+1) if Primelist[j]!=0]
P=[p for p in Primes if p>10**5]

ANS=[1]
for i in range(len(P)):
    for j in range(i,len(P)):
        ANS.append(P[i]*P[j])
ANS.sort()

print(ANS[int(input())-1])