n=int(input())
ans=0
for i in range(10,min(100,n+1)):
  if i%3==0:ans+=1
for i0 in range(0,10**9,3*10**8):
  for i1 in range(0,10**8,3*10**7):
    for i2 in range(0,10**7,3*10**6):
      for i3 in range(0,10**6,3*10**5):
        for i4 in range(0,10**5,3*10**4):
          for i5 in range(0,10**4,3*10**3):
            for i6 in range(0,10**3,3*10**2):
              for i7 in range(0,10**2,3*10**1):
                for i8 in range(0,10**1,3**10**0):
                  s=i0+i1+i2+i3+i4+i5+i6+i7+i8
                  if 100<=s<=n:ans+=1
print(ans)