M = 10 ** 5 + 1000
F = [True] * M
F[0] = False
F[1] = False
for i in range(M):
    if not F[i]:
        continue
    for j in range(i * i, M, i):
        F[j] = False
        
facts = []
for i in range(10 ** 5 + 1, M):
    if F[i]:
        facts.append(i)
        
N = int(input())
S = {1}
for i in range(len(facts)):
    for j in range(i, len(facts)):
        S.add(facts[i] * facts[j])
        
print(sorted(list(S))[N - 1])