import calendar
happyday = 0
for i in range(1,12+1):
    r = calendar.monthrange(2015,i)
    for j in range(1,r[1]+1):
        #print(i,j,int(j/10) + j%10)
        if i==int(j/10) + j%10:
        	happyday += 1
print(happyday)