list1 = []
for X in range(1,13):
    for o in range(1,10):
        if X ==o:
            list1.append('HAPPY DAY')
    for p in range(10,32):
        y = str(p)
        Y = int(y[0])+int(y[1])
        if X == Y:
            list1.append('HAPPY DAY')
print(len(list1)-1)