import sys

readline = sys.stdin.readline

ns = lambda: readline().rstrip()
ni = lambda: int(readline().rstrip())
nm = lambda: map(int, readline().split())
nl = lambda: list(map(int, readline().split()))

def solve():
    n = ni()
    m = 10**5 + 10**2
    s = [1]*m
    for i in range(3, m, 2):
        if s[i]:
            for j in range(i*i, m, i):
                s[j] = 0
    g = [i for i in range(100001, m, 2) if s[i]]
    f = sorted(set([x*y for x in g for y in g] + [1]))
    print(f[n-1])
    return

solve()