#include<fstream>
using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int main()
{
    int n, s = 1;
    fin>>n;

    if(n == 1)
    {
        fout<<1;
        return 0;
    }

    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
        {
            if(i/j == 0)
                s++;
        }

    fout<<s;

    fin.close();
    fout.close();
}