def sieve(n):
    res = [True for _ in range(n + 1)]
    res[0] = False
    res[1] = False
    i = 2
    while i * i <= n:
        if res[i]:
            for j in range(i * 2, n + 1, i):
                res[j] = False
        i += 1
    return res

S = sieve(101000)
P = [p for p in range(101000) if S[p] and p > 100000]

Q = [1]

for i in range(10):
    for j in range(i, 10):
        Q.append(P[i] * P[j])

Q.sort()

print(Q[int(input()) - 1])