P = [0] * 400
P[0] = 1
Year = 2002
for i in range(1,400):
    if Year % 400 == 0:
        P[i] = P[i-1] + 2
    elif Year % 100 == 0:
        P[i] = P[i-1] + 1
    elif Year % 4 == 0:
        P[i] = P[i-1] + 2
    else:
        P[i] = P[i-1] + 1
    P[i] %= 7
    Year += 1
N = int(input())
M = 2014
Div1 = N // 400
Rem1 = N % 400
Div2 = M // 400
Rem2 = M % 400
print((Div1 * P.count(3) + P[:Rem1].count(3)) - (Div2 * P.count(3) + P[:Rem2].count(3)))