n=int(input())
'''
x=(a*p+b)/(p*p-1)
'''
ans=0
for a in range(10):
  for b in range(10):
    if a==b:
      continue
    m=max(a+1,b+1,2)
    ng,ok=10**9+1,m-1
    while abs(ng-ok)>1:
      p=(ng+ok)//2
      if n*(a*p+b)>p*p-1:
        ok=p
      else:
        ng=p
    #print(a,b,p-m)
    ans+=ok-m+1
print(ans)