import sys


def input(): return sys.stdin.readline().rstrip()


def main():
    N = int(input())
    N -= 2014
    ans = 399 * (N//2800)
    N %= 2800
    cnt = 0
    for i in range(2015, 2015+N):
        if i % 400 == 0 or (i % 100 != 0 and i % 4 == 0):
            cnt += 2
        else:
            cnt += 1
        if cnt % 7 == 0:
            ans += 1
    print(ans)


if __name__ == '__main__':
    main()