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Cod sursa(job #366750)
#include<iostream.h>
#include<fstream.h>
fstream in("fractii.in",ios::in), out("fractii.out",ios::out);
int cmmdc(long a,long b)
{ while (a!=b)
if(a>b) a=a-b;
else b=b-a;
return a;
}
void main()
{
long n,i,j,x=0,y;
in>>n;
for(i=1;i<=n;i++)
for(j=1;j<=n;j++)
{if(i%2==0 && j%2==0) break;
y=cmmdc(i,j);
if (y==1) x++;
j++;
}
out<<x;
}