N = int(input())

import math

def is_prime(n):
    if n == 1: return False
    
    for k in range(2, int(math.sqrt(n)) + 1):
        if n % k == 0:
            return False
    
    return True

Prime = []
count = 0
for i in range(10**5 + 1, 10**6, 2):
    if is_prime(i) == True:
        Prime.append(i)
        count += 1
        if count > 5:
            break
        else:
            pass
    else:
        pass

Ans = [1]
for i in range(6):
    for j in range(i, 6):
        Ans.append(Prime[i] * Prime[j])

Ans.sort()
print(Ans[N-1])