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Cod sursa(job #65491)
#include <fstream.h>
long n,p,q,sol;
ifstream f ("fractii.in");
ofstream g ("fractii.out");
int verifica(int x, int y)
{if (x%y==0) return 0;
else
if (y%x==0) return 0;
else
return 1;
}
int main()
{f>>n;
sol=n*2-1;
for (int i=2;i<=n;i++)
for (int j=2;j<=n;j++)
if ( verifica (i,j) ) sol++;
g<<sol;
return 1;
}