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Cod sursa(job #765321)
#include<fstream>
using namespace std;
int main()
{
ifstream fcin("sum.in");
ofstream fcout("sum.out");
int n,x,phi[100005],i,j,max=-1;
fcin>>n;
for(i=1;i<=n;i++)
{
fcin>>x;
if(x>max)
max=x;
}
for(i=2;i<=max;i++)
phi[i]=i;
for(i=2;i<=max;i++)
if(phi[i]==i)
for(j=i;j<=max;j+=i)
phi[j]/=i,phi[j]*=(i-1);
fcin.close();
ifstream fcin2("sum.in");
fcin2>>n;
while(n--)
{
fcin2>>x;
fcout<<2*x*phi[x]<<"\n";
}
return 0;
}