N=int(input())
ans=0
for a in range(10):
  for b in range(10):
    if a==b: continue
    l,r=0,10**10
    while r-l>1:
      mid=(l+r)//2
      if mid**2-a*N*mid-1-b*N<0: l=mid
      else: r=mid
    if max(a,b)+1<=l: ans+=l-max(a,b)
print(ans)