import sys
input=sys.stdin.readline
def I(): return int(input())
def MI(): return map(int, input().split())
def LI(): return list(map(int, input().split()))
mod=10**9+7

def main():
    #nまでの素数を列挙(n loglogn)
    N=I()
    n = 3*(10**5)

    #is_prime[i]にはi-1が素数か否かを示すboolが入る，[0]に1の素数判定がある．
    is_prime = [True]*(n+1)
    is_prime[0] = False

    for i in range(2, n+1):
        if is_prime[i-1]:
            j = 2 * i
            while j <= n:
                is_prime[j-1] = False
                j += i

    table=[]
    for i in range(10**5,n):
        if is_prime[i]:
            table.append(i+1)
        if len(table)>=100:
            break
    
    ans=[1]
    M=len(table)
    
    for i in range(M):
        for j in range(M):
            ans.append(table[i]*table[j])
    ans.sort()
    print(ans[N-1])
            


main()