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Cod sursa(job #751303)
#include <stdio.h>
#define NMAX 100002
int main()
{
freopen("sum.in", "r", stdin);
freopen("sum.out", "w", stdout);
int s[NMAX];
int i, j, n, x;
long long ans;
for (i=1; i<NMAX; ++i)
s[i] = i;
for (i=2; i<NMAX; ++i)
if (s[i] == i)
for (j = i; j<=NMAX; j+=i)
s[j] = s[j]/i*(i-1);
scanf("%d", &n);
while (n) {
scanf("%d", &x);
ans = 1ll*2*s[x]*x;
printf("%lld\n", ans);
--n;
}
return 0;
}