#include<fstream>
using namespace std;
int main(){
    fstream in("fractii.in", ios::in);
    fstream out("fractii.out", ios::out);
    unsigned int x;
    in>>x;
    unsigned int ori=x;
    bool v=1; unsigned int max;
for(int c=2;c<=x;c++,ori++){ 
        
 

for(int k=2;k<=x;k++,v=1){ 
if(c%k==0||k%c==0) { v=0; } else { 

if(c<k) max=c; else max=k; 

for(int l=2;l<=max!=1&&max/2;l++) if(c%l==0&&k%l==0) v=0;

}

if(v==1) ori++;


}}
out<<ori; 
return 0;
}