import calendar
N = int(input())

def get_swt(start, end):
    count = 0
    for year in range(start, end):
        fw = calendar.weekday(year, 7, 23)
        if w == fw:
            count += 1
    return count

w = calendar.weekday(2014, 7, 23)
x = 57
if N <= 2400:
    c = get_swt(2015, N+1)
    print(c)

else:
    a, b = divmod(N-2400, 400)
    ax = a*x
    c = get_swt(2400, 2400+b+1)
    print(c+ ax + 54)