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#include<iostream>
#include<fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int numara(unsigned n);
int main(){
unsigned n,k;
in>>n;
k=numara(n);
out<<k;
return 0;
}
int numara(unsigned n){
unsigned k=1;
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
if(i/j!=1)
k++;
return k;
}