#include <iostream>
#include <fstream>
using namespace std;

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

int n, i, j, f = 1;

int cmmdc(int a, int b)
{
    int c;

    while(b)
    {
        c = a % b;
        a = b;
        b = c;
    }

    return a;
}

int main()
{
    fin >> n;

    for(i = 1; i <= n; i++)
    {
        if(n==1) break;
        if(cmmdc(i,n) == 1)
            f+=2;
    }

    fout << f;

    return 0;
}