n=int(input())
s=""
index=-1
cnt=0
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)

while True:
    index=s.find("z",index+1)
    if index==-1:
        break
    else:
        cnt+=1
print(cnt)