l=[]
N=int(input())
def eratosthenes(n):
    if n==2:
        return [2]
    prime = [2]
    limit = int(n**0.5)
    data = [i + 1 for i in range(2, n, 2)]
    while True:
        p = data[0]
        if limit <= p:
            return prime + data
        prime.append(p)
        data = [e for e in data if e % p != 0]
x=eratosthenes(150000)
ans=[1]
for i in x:
    if i>100000:
        l.append(i)
    if len(l)==10:
        break
for i in range(10):
    for j in range(10):
        ans.append(l[i]*l[j])
ans=list(set(ans))
ans.sort()
print(ans[N-1])