N = int(input())
import sys
if N == 1:
    print(1)
    exit()
    
dat = [0] * 10 ** 6
C = 10 ** 6
prime = []
for i in range(2,C):
    if dat[i] == 0:
        for j in range(i*2,C,i):
            dat[j] = 1
        if i > 10 ** 5:
            prime.append(i)
l = []
for i in range(10):
    for j in range(i,10):
        l.append(prime[i] * prime[j])
l.sort()
print(l[N-2])