def f(n):
    now = 0
    cnt = 0
    for i in range(2015, 2015 + n):
        if i % 400 == 0:
            now += 366 % 7
        elif i % 100 == 0:
            now += 365 % 7
        elif i % 4 == 0:
            now += 366 % 7
        else:
            now += 365 % 7
        now %= 7
        cnt += int(now == 0) 
    return cnt

N = int(input())
N -= 2014
print(f(2800) * (N // 2800) + f(N % 2800))