N = int(input())

M = 10**5
L = [0]*(10*M+1)
L2 = []
for i in range(2, 10*M+1):
    if L[i] == 0:
        j = 1
        while i*j <= 10*M:
            L[i*j] = 1
            j += 1
        if i > M:
            L2.append(i)
        if len(L2) > N:
            break
ans = [1]
for i in range(N):
    ans.append(L2[i]**2)
    for j in range(i+1, N):
        ans.append(L2[i]*L2[j])
ans.sort()
print(ans[N-1])