n = int(input())
if n == 1:
    print(1)
    exit()
N = 2 * (10 ** 5)


def prime_hantei(n):
    kouho = []
    is_prime = [0] * (n + 1)
    is_prime[2] = 1
    len3 = len(is_prime[3::2])
    is_prime[3::2] = [1] * (len3)
    for i in range(3, int(n ** 0.5) + 1, 2):
        if is_prime[i]:
            len_is = len(is_prime[i * i :: i + i])
            is_prime[i * i :: i + i] = [0] * len_is
    for j in range(10 ** 5 + 1, 10 ** 5 + 10 ** 2):
        if is_prime[j] == 1:
            kouho.append(j)
    return kouho


kouho = prime_hantei(N)
ans = []
for a in kouho:
    for b in kouho:
        ans.append(a * b)
ans = list(set(ans))
ans.sort()
ans = [0] + [1] + ans
print(ans[n])