result = []
for i in range(10**5, 10**5+200):
    flag = True
    for j in range(2, int(i**0.5)+1):
        if i % j == 0:
            flag = False
            break
    if flag:
        result.append(i)

ans = set()
for i in result:
    for j in result:
        ans.add(i * j)
           
ans = [1] + list(ans)
ans.sort()

n = int(input())
print(ans[n-1])