import calendar as ca

monthend = []
count = 0

for i in range(12):
    tmp = ca.monthrange(2015, i+1)
    monthend.append(tmp[1])
    # print(monthend)

for i in range(12):
    for j in range(monthend[i]):
        j = j+1
        if (i+1) == int(j/10) + j%10:
            count = count + 1
print(count)