import sys
import numpy as np

read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

N = int(read())

U = 10**5 + 1000
is_prime = np.zeros(U, np.bool_)
is_prime[2] = 1
is_prime[3::2] = 1
for p in range(3, U, 2):
    if p * p > U:
        break
    if is_prime[p]:
        is_prime[p * p::p + p] = 0
primes = np.where(is_prime)[0]

primes = primes[primes > 10**5]

se = set(x * y for x in primes for y in primes)
se.add(1)

nums = sorted(se)[:10]

print(nums[N - 1])