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Cod sursa(job #942151)
#include <fstream>
#include <limits>
using namespace std;
ifstream in("sum.in");
ofstream out("sum.out");
void sumeaza(long x);
long cmmdc(long a,long b);
int main()
{
int n,c;
in>>n;
in.ignore(numeric_limits<streamsize>::max(),'\n');
for(int i=0;i<n;++i)
{
in>>c;
in.ignore(numeric_limits<streamsize>::max(),'\n');
sumeaza(c);
}
in.close();
out.close();
return 0;
}
void sumeaza(long x)
{
long long sum=0;
const long N=100000;
long phi[N+1];
for (long i = 1; i <= N; ++i)
phi[i] = i-1;
for (long i = 2; i <= N; ++i)
for (long j = 2*i; j <= N; j += i)
phi[j] -= phi[i];
out<<2*phi[x]*x<<"\n";
}
long cmmdc(long a,long b)
{
int r;
while (b)
{
r=a%b;
a=b;
b=r;
}
return a;
}