mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    if N == 1:
        print(1)
        exit()

    cnt = N-1
    M = 10**5+1
    M_list = []
    while True:
        flg = 0
        for i in range(2, 10**5+1):
            if M % i == 0:
                flg = 1
                break
        if flg:
            M += 1
        else:
            cnt -= 1
            M_list.append(M)
            if cnt == 0:
                break
            M += 1

    L = []
    for i in range(len(M_list)):
        for j in range(i, len(M_list)):
            L.append(M_list[i] * M_list[j])
    L.sort()
    print(L[N-2])


if __name__ == '__main__':
    main()