#include <algorithm>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <map>
#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <vector>

using namespace std;

#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define sz size()
#define all(x) (x).begin(),(x).end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

const int mod=1e9+7;
const int inf=2e9+100;
const double eps=1e-9;

int main() {
#ifdef LOCAL_
    freopen("inp.txt","r",stdin);
#endif
    freopen("fractii.in", "r", stdin);
    freopen("fractii.out", "w", stdout);

    int n,res;
    cin>>n;
    res = n*2-1;
    for(int i=2;i<=n;i++){
        for(int j=2;j<=n;j++){
            if (i!=j && i%j && j%i) res++;
        }
    }
    cout<<res<<endl;
    return 0;
}