#include <cstdio>

using namespace std;

FILE *fin, *fout;

int main()
{
    fin = fopen("ciur.in", "r");
    fout = fopen("ciur.out", "w");

    int n;
    fscanf(fin, "%d", &n);

    bool C[200000] = {0};
    int rez = 0;

    for(int i = 2; i*i <= 10; i++)
    {
        for(int j = i; j <= 10; j*=i)
            C[j] = 1;
    }
    for(int i = 2; i <= 10; i++)
        if(C[i] == 0)
            rez++;
    fprintf(fout, "%d\n", rez);
}