import sequtils,strutils,algorithm
var
    N = stdin.readline.parseInt
    P = newSeq[int64](0)
    ans = newSeq[int64](0)
if N == 1:
    echo 1
else:
    var b = 100000
    while P.len < 6:
        b += 1
        var f = false
        for i in 2..10000:
            if b mod i == 0:
                f = true
                break
        if not f:
            P.add(b.int64)
    var cnt = 1

    for i in 0..5:
        for j in 0..i:
            cnt += 1
            ans.add(P[i] * P[j])
    ans.sort()
    echo ans[N - 2]