n=list(range(1,int(input())+1))
b=''
for a in n:
    if a%3==0 and a%5==0:
        a='FizzBuzz'
    elif a%3==0:
        a='Fizz'
    elif a%5==0:
        a='Buzz'
    b+=str(a)



b=list(b)

print(b.count('z'))