#include <iostream>

using namespace std;

int main()
{
    int n,i,j,nr,ok,x;
    cin>>n;
    nr=0;
    for(i=2;i<=n;i++)
        for(j=1;j<=n;j++)
        {
        ok=1;
        if(j>i)
        for(x=2;x<=i;x++)
            if((i%x==0) and (j%x==0))
            ok=0;
        else
        for(x=2;x<=j;x++)
            if((i%x==0) and (j%x==0))
            ok=0;
        if(ok==1)
            nr++;
        }
    cout<<nr;
    return 0;
}
//1/1! 1/2 1/3 1/4
//1/2 2/2! 2/3 2/4!
//1/3 2/3 3/3! 4/3
//1/4 2/4! 3/4 4/4!