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Cod sursa(job #982216)
#include<iostream>
using namespace std;
#include<stdio.h>
FILE *f,*g;
int n,x,i,j,w,a[100005];
long long suma;
int main()
{
f=fopen("sum.in","r");
g=fopen("sum.out","w");
fscanf(f,"%d",&n);
for(i=0;i<n;i++)
{
fscanf(f,"%d",&x);
for(j=1;j<=100000;j++)
a[j]=j-1;
for(j=2;j<=100000;j++)
for(w=j+j;w<=100000;w=w+j)
a[w]=a[w]-a[j];
fprintf(g,"%lld\n",(long long)a[x]*x*2);
}
}