n = int(input())

def FizzBuzzString(N):
    s = ""
    for i in range(1,N + 1):
        if i % 15 == 0:
            s += 'FizzBuzz'
        elif i % 3==0:
            s+='Fizz'
        elif i % 5==0:
            s+='Buzz'
        else:
            s+=str(i)
    return s

print(str(FizzBuzzString(n)).count('z'))