a=int(input())
a2=1998
monthdays=0
blackfriday=0
days2=3
days3=0
for i in range((a-1998+1)*12):
    days3+=1
    if a2%4==0 and a2%100!=0:
        if i%12==0 or i%12==2 or i%12==4 or i%12==6 or i%12==7 or i%12==9 or i%12==11:
            monthdays=31
        elif i%12==1:
            monthdays=29
        else:
            monthdays=30
    else:
        if a2%400==0 and a2%100==0:
            if i%12==0 or i%12==2 or i%12==4 or i%12==6 or i%12==7 or i%12==9 or i%12==11:
                monthdays=31
            elif i%12==1:
                monthdays=29
            else:
                monthdays=30
        else:
            if i%12==0 or i%12==2 or i%12==4 or i%12==6 or i%12==7 or i%12==9 or i%12==11:
                monthdays=31
            elif i%12==1:
                monthdays=28
            else:
                monthdays=30
    for j in range(1,monthdays+1):
        days2+=1
        if days2==8:
            days2=1
        if days2==5 and j==13:
            blackfriday+=1
    if a2!=a:
        blackfriday=0
    if days3%12==0:
        days3=0
        a2+=1
print(blackfriday)
/**************************************************************
	Problem: 1853
	User: admin
	Language: Python
	Result: Accepted
	Time:515 ms
	Memory:34480 kb
****************************************************************/