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Cod sursa(job #57859)
#include<fstream.h>
int n,c,i,j,x,y,r;
int main()
{ ifstream fin("fractii.in");
ofstream fout("fractii.out");
fin>>n;
c=0;
for(i=2;i<=n;i++)
{ for(j=1;j<i;j++)
{ x=i;
y=j;
while(x%y)
{ r=x%y;
x=y
y=r
if(y==1) c++;
}
j=i;
x=i;
y=j;
while(x%y)
{ r=x%y;
x=y
y=r
if(y==1) c++;
}
fout<<2*c+1;
fin.close();
fout.close();
return 0;
}