T=[i+1 for i in range(15)]
for i in range(15):
    k=i+1
    if k%15==0:
        T[i]="Fizz Buzz"
    elif k%3==0:
        T[i]="Fizz"
    elif k%5==0:
        T[i]="Buzz"
    else:
        T[i]=str(k)
U=[0]
X=0
for i in range(15):
    X+=T[i].count("z")
    U.append(X)

N=int(input())
Q,R=divmod(N,15)
print(Q*U[-1]+U[R])