D = [31,28,31,30,31,30,31,31,30,31,30,31]

cnt = 0
for m,d in enumerate(D):
    m = m+1
    for i in range(d):
        day = i+1    
        sm = int(str(day).zfill(2)[0]) + int(str(day).zfill(2)[1])
        if m == sm:
            cnt += 1
print(cnt)