import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
sys.setrecursionlimit(10 ** 7)

from itertools import combinations


def eratosthenes(n):
    prime_list = [True] * (n + 1)
    prime_list[0] = False
    prime_list[1] = False
    for i, prime in enumerate(prime_list[2:int(n ** 0.5) + 1]):
        if prime:
            for j in range(pow(i + 2, 2), n + 1, i + 2):
                prime_list[j] = False
    return prime_list


n = int(readline())
ans = [1]
memo = [0] * (n + 1)
idx = 0
for i, j in enumerate(eratosthenes(10 ** 5 + 10 ** 3)):
    if j and i > 10 ** 5:
        memo[idx] = i
        idx += 1
        if idx == n + 1:
            break
for comb in combinations(memo, 2):
    ans.append(comb[0] * comb[1])
ans.sort()
print(ans[n - 1])