N = int(input())
m = 10**5
ans = 0
N -= 1
l = []
if N == 0:
  ans = 1
else:
  for i in range(1,11):
    for j in range(1,11):
      l.append((m+i)*(m+j))
  l.sort()
  ans = l[N]

print(ans)