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Cod sursa(job #112265)
#include<fstream.h>
ifstream fin("fractii.in");
ofstream fout("fractii.out");
void main()
{long n,i,j,k,rez=0;
int sw;
fin>>n;
for (i=1; i<=n; i++)
for (j=1; j<=n; j++)
if (i!=j) {sw=1; for (k=2; k<=j; k++)
if (i%k==0 && j%k==0) {sw=0; break;}
if (sw) rez++; }
fout<<rez+1;
fin.close();
fout.close();
}