n=int(input())
s=""
lss=[]
for i in range(1,n+1):
    if i%3==0 and i%5==0:
        s+="FizzBuzz"
    elif i%3==0:
        s+="Fizz"
    elif i%5==0:
        s+="Buzz"
    else:
        s+=str(i)
lss=list(s)
print(lss.count("z"))