Cod sursa(job #2782710)
Utilizator | Ana-Maria Tomoiala Ana100 | Data | 12 octombrie 2021 20:43:30 |
---|---|---|---|
Problema | Sum | Scor | 0 |
Compilator | cpp-64 | Status | done |
Runda | Arhiva de probleme | Marime | 0.57 kb |
#include <fstream>
using namespace std;
ifstream cin("sum.in");
ofstream cout("sum.out");
int prim[100005],marcat[100005];
int main()
{
int n,sum=1;
cin>>n;
for(int i=2;i<=2*n;i++)
{
if(prim[i]==0)
{
if(n%i==0)
{
for(int j=i;j<=2*n;j=j+i)
{
prim[j]=1;
marcat[j]=1;
}
}
}
}
for(int i=2;i<=2*n;i++)
{
if(marcat[i]==0)
sum+=i;
}
cout<<sum<<endl;
return 0;
}