import sys
input=lambda: sys.stdin.readline().rstrip()
ans=0
M=[31,28,31,30,31,30,31,31,30,31,30,31]
for i in range(12):
  for j in range(1,M[i]+1):
    d=0
    for k in str(j):
      d+=int(k)
    if i+1==d:
      ans+=1
print(ans)