from itertools import chain


def prime_set(N):
    """
    Nまでの素数のsetを返す
    """
    if N < 4:
        return ({}, {}, {2}, {2, 3})[N]
    Nsq = int(N ** 0.5 + 0.5) + 1
    primes = {2, 3} | set(chain(range(5, N + 1, 6), range(7, N + 1, 6)))
    for i in range(5, Nsq, 2):
        if i in primes:
            primes -= set(range(i * i, N + 1, i * 2))
    return primes


U = 10**5+1000
P = prime_set(U)

ans = [1]
tmp = []
for x in range(10**5+1, U):
    if x in P:
        tmp.append(x)

for x in tmp:
    for y in tmp:
        ans.append(x*y)
ans = sorted(set(ans))
print(ans[int(input())-1])