import datetime
import sys

sys.setrecursionlimit(10 ** 6)
int1 = lambda x: int(x) - 1
p2D = lambda x: print(*x, sep="\n")
def MI(): return map(int, sys.stdin.readline().split())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LLI(rows_number): return [LI() for _ in range(rows_number)]

def main():
    # 2014年7月23日(水)
    n = int(input())
    cnt2014 = [6] * 15 + [5] * 385
    p, r = divmod(n, 400)
    cntn = [p + 1] * (r + 1) + [p] * (399 - r)
    ans = 0
    for i,[c0,c1] in enumerate(zip(cnt2014,cntn)):
        d = datetime.date(2000 + i, 7, 23)
        ans += (d.weekday() == 2)*(c1-c0)
    print(ans)

main()