n = int(input())
string = ''
for i in range(1, n+1):
    if i % 15 == 0:
        string += 'FizzBuzz'
    
    elif i % 5 == 0:
        string += 'Buzz'
    
    elif i % 3 == 0:
        string += 'Fizz'
    
    else:
        string += str(i)

print(string.count('z'))