#include <cstdio>
using namespace std;

int cmmdc(int a, int b){
    int t;
    while (b != 0)
    {
        t = b;
        b = a % b;
        a = t;
    }
    return a;
}

int main() {
    int n,u,i,j;
    u=0;
    scanf("%d",&n);
    for(i=1;i<=n;i++){
        for(j=1;j<=n;j++){
            if(cmmdc(i,j)==1)
                u++;
        }
    }
    printf("%d",u);
    return 0;
}