import sys
input = sys.stdin.readline
N = int(input())
if N == 1:
  print(1)
  exit(0)
table = [1] * (10 ** 6)
for i in range(2, 10 ** 5 + 1):
  for j in range(i, 10 ** 6, i): table[j] = 0
t = []
for i in range(2, 10 ** 6):
  if table[i]: t.append(i)
  if len(t) >= 10: break
tt = []
for i in range(10):
  for j in range(i, 10): tt.append(t[i] * t[j])
tt.sort()
print(tt[N - 2])