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Cod sursa(job #988341)
#include <iostream>
#include <stdio.h>
#include <cstring>
#include <fstream>
using namespace std;
int n;
long long x;
int phi[100010];
void calculeaza_phi()
{
int i,j;
for(i=1; i<=100010; i++) phi[i]=i-1;
for(i=2; i<=100010; i++)
for(j=2*i; j<=100010; j+=i) phi[j]-=phi[i];
}
int main()
{
freopen("sum.in","r",stdin);
freopen("sum.out","w",stdout);
int i;
calculeaza_phi();
scanf("%d",&n);
for(i=1; i<=n; i++)
{
scanf("%d",&x);
printf("%d\n",2*phi[x]*x);
}
return 0;
}