def is_leap(n):
    if n % 400 == 0:
        return True
    if n % 100 == 0:
        return False
    if n % 4 == 0:
        return True
    return False

def loop_count(start, end):
    total = 0
    diff = 0
    for i in range(start, end+1):
        if is_leap(i):
            diff += 2
        else:
            diff += 1
        if diff % 7 == 0:
            total += 1
            diff = 0
    return total


N = int(input())
total = 0
if N <= 2414:
    total = loop_count(2015, N)
else:
    total = loop_count(2015, 2414)
    total *= (N-2014) // 400
    total += loop_count(2014 + (N-2014)//400*400 + 1, N)

print(total)