n = int(input())

if n == 1:
    print(1)
    exit()

n -= 2
IsPrime = [True for _ in range(10**6 + 1)]
IsPrime[0] = IsPrime[1] = False
for i in range(2, 10**6 + 1):
    if IsPrime[i]:
        for j in range(i + i, 10**6 + 1, i):
            IsPrime[j] = False

P = []
for i in range(10**5 + 1, 10**6 + 1):
    if IsPrime[i]:
        P.append(i)
        if len(P) == 10:
            break

ANS = []
for i in range(10):
    for j in range(i, 10):
        ANS.append(P[i] * P[j])
ANS.sort()
print(ANS[n])