max_days = [(1,31),(2,28),(3,31),(4,30),(5,31),(6,30),(7,31),(8,31),(9,30),(10,31),(11,30),(12,31)]

total = 0
for max_day in max_days :
    for i in range(max_day[1]) :
        if (max_day[0] == i // 10 + i % 10) :
            total += 1
print(str(total))