n = int(input())

import math

def sieve(n):
    ass = []
    is_prime = [True]*(n+1)
    is_prime[0] = False
    is_prime[1] = False

    for i in range(2, int(math.sqrt(n))+1):
        if not is_prime[i]:
            continue
        for j in range(i*2, n+1, i):
            is_prime[j] = False
    for i in range(n+1):
        if is_prime[i]:
            ass.append(i)
    return(ass)

S = sieve(10**5)
T = sieve(2*10**5)
#print(len(S))
#print(len(T))
P = T[len(S):len(S)+10]
#print(P)
ans = [1]
for i in range(10):
    for j in range(10):
        ans.append(P[i]*P[j])
ans = list(set(ans))
ans.sort()
print(ans[n-1])