Cod sursa(job #95574)
Utilizator | MciprianM MciprianM | Data | 29 octombrie 2007 16:01:10 |
---|---|---|---|
Problema | Fractii | Scor | 0 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.37 kb |
#include<fstream>
using namespace std;
long long int n;
long long int l;
int main(){
ifstream f("fractii.in");
f>>n;
f.close();
long long int i,j,a;
l=n;
for(i=2;i<=n;i++){
a=0;
for(j=i;j<=n;j+=i){
a++;
}
l+=(n-i+1-a);
}
l*=2;
ofstream g("fractii.out");
g<<l<<endl;
g.close();
return 0;
}