#include<fstream>
#include<algorithm>
#include<cmath>
#define N 2000100
#define FOR(a,b,c) for(register int a=b;a<=c;++a)
using namespace std;
ifstream f("ciur.in");
ofstream g("ciur.out");
const double eul=2.718281828459045235;
int n;
int sol(int x)
{
    return (int)log(x);
}
int main ()
{
    f>>n;
    n--;
    g<<n/sol(n);
    return 0;
}
//Look at me!Look at me!The monster inside me has grown this big!