#include <cstdio>

using namespace std;

int main()
{ int n;
    FILE *f=fopen("ciur.in","r"),*g=fopen("ciur.out","w");
    fscanf(f,"%d",&n);
    int v[99999];
    for(int i=1;i<=n;i++)
    {
        v[i]=i;
    }

    for(int i=4;i<=n;i=i+2)
    {
        v[i]=0;

    }
    for(int i=6;i<=n;i=i+3)
    {
        v[i]=0;


    }
    for(int i=10;i<=n;i=i+5)
    {
        v[i]=0;
    }
    int x=0;

    for(int i=2;i<=n;i++)
    {
        if(v[i]>0) x++;
    }

    fprintf(g,"%d",x);
    return 0;
}