month = [i for i in range(1, 13)]
date = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
s = 0

for month in range(1, 13):
    for d in range(1, date[month-1]+1):
        a = d // 10 #日付10の位
        b = d - a*10 #日付1の位
        if month == a+b:
            s = s+1

print(s)