#include<bits/stdc++.h>
long long n,s=0,kq=0,b=0;
bool kt[100000];
using namespace std;
int main(){
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
freopen("BEAUNUM.inp","r",stdin);
freopen("BEAUNUM.out","w",stdout);
memset(kt,true,sizeof(kt));
kt[0]=kt[1]=false;
for(int i=2;i*i<=1e5+5;i++)
if (kt[i])
for (int j=i*i;j<=1e5+5;j+=i)
kt[j]=false;
cin>>n;
while (b<n){
s++;
if (kt[s]){
b=s*s*s*s;
kq++;
}
}
if (b>n) kq--;
cout<<kq;
return 0;
}
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