month=range(1, 13)
L=[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
c=0
def happyday(mon, day):
    if day < 10:
        days=[0, day]
    else:
        days=map(int,str(day))
    return mon==days[0]+days[1]


for a in month:
    for b in range(1, L[a-1]+1):
        if happyday(a, b):
            c+=1
print c