n = int(input())

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

n -= 1
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

for i in range(10**5 + 1, 10**6 + 1):
    if IsPrime[i]:
        n -= 1
        if n == 0:
            print(i * i)
            break