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Cod sursa(job #660069)
// sum
#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream f("sum.in");
ofstream g("sum.out");
#define X 100001
int phi[X];
int main()
{
for (int i=1;i<=X;i++)
phi[i]=i;
for (int i=2;i<=X;i++)
if (phi[i]==i)
for (int j=i;j<=X;j+=i) phi[j] -= phi[j] / i;
int n,t;
f>>t;
for(int i=1;i<=t;i++)
{
f>>n;
g<<n*phi[n]*2<<endl;
}
f.close();
g.close();
}