N=int(input())

x=150000
L=390
Primelist=[i for i in range(x+1)]
Primelist[1]=0 # 1は素数でないので0にする.
 
for i in Primelist:
    if i>L:
        break
    if i==0:
        continue
    for j in range(2*i,x+1,i):
        Primelist[j]=0

Primes=[Primelist[j] for j in range(x+1) if Primelist[j]!=0]

USE=[0]*(N+1)
L=len(Primes)

for i in range(L):
    x=Primes[i]
    if x>N:
        break
    for j in range(i+1,L):
        y=x*Primes[j]
        if y>N:
            break
        for k in range(j+1,L):
            z=y*Primes[k]
            if z>N:
                break
            for l in range(k+1,L):
                w=z*Primes[l]
                if w>N:
                    break
                USE[w]=1

print(sum(USE))