import datetime

def main():
    printday = datetime.datetime(2015, 1, 1)
    puluse = datetime.timedelta(days=1)
    cnt=0
    for i in range(365):
        m = printday.month
        d = printday.day%10 + printday.day//10
        if m == d:
            cnt = cnt + 1
        printday = printday + puluse
    print(cnt)

if __name__=="__main__":
    main()