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Cod sursa(job #332053)
#include<stdio.h>
unsigned long a,b,n,c,z;
long euclid(int a, int b)
{
if (!b)
return a;
else
euclid(b,a%b);
}
int main(void)
{
freopen("fractii.in","r",stdin);
freopen ("fractii.out","w",stdout);
scanf("%d",&n);
for(int i=1;i<=n;i++)
for(int j=1;j<=n;j++)
if(euclid(i,j)==1)
c++;
printf("%d",c);
return 0;
}