#coding=UTF-8

#365日のトライ
dom=[31,28,31,30,31,30,31,31,30,31,30,31]
#2 4 6 9 11
doy=0
for idx in range(0,12,1):
    doy=doy+dom[idx]

#print(doy)
ans=0
for idx in range(0,12,1):
    for idy in range(0,dom[idx],1):
#        print("%02d" % (idy+1))
        moji="%02d" % (idy+1)
        hica=int(moji[0])+int(moji[1])
        if idx+1==hica:#0-orginに注意
            ans=ans+1
print(ans)