def primes(n):
    memo = [True] * (n + 1)
    i = 2
    while i * i <= n:
        if memo[i]:
            j = i << 1
            while j <= n:
                memo[j] = False
                j += i
        i += 1
    return [i for i in range(n + 1) if memo[i] and i >= 10 ** 5 + 1]

from itertools import combinations

N = int(input())
P = primes(10 ** 6)[:N]

A = [1] + sorted(x * y for x, y in combinations(P, 2))

print(A[N - 1])