from datetime import date,timedelta

ans = 0
s = date(2015,1,1)
for i in range(365):
    x = s + timedelta(days=i)
    m = x.month // 10 + x.month % 10
    d = x.day // 10 + x.day % 10
    if m == d:
        ans += 1        
print(ans)