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Cod sursa(job #756467)
#include<fstream>
using namespace std;
int main()
{
ifstream f("sum.in");
ofstream g("sum.out");
long long v[100010],x[100010],i,j,n,l;f >> n;
for(i=2;i<100010;i++)v[i]=i;
for(i=2;i<100010;i++)
if(v[i]==i)
for(j=i;j<100010;j+=i)v[j]=v[j]/i*(i-1);
for(l=1;l<=n;l++) {f >> x[l];g << v[x[l]]*2*x[l] << endl;}
f.close();g.close();
return 0;
}