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Cod sursa(job #756452)
#include<fstream>
using namespace std;
int main()
{
ifstream f("sum.in");
ofstream g("sum.out");
long v[110000],x[110000],i,j,n;f >> n;
for(i=1;i<=n;i++)f >> x[i];
for(i=1;i<=110000;i++)v[i]=i;
for(i=1;i<=110000;i++)
if(v[i]==i)
for(j=i;j<=110000;j=j+i)v[j]=v[j]/i*(i-1);
for(i=1;i<=n;i++) g << v[x[i]]*2*x[i];
f.close();g.close();
return 0;
}