/*
- sufficienly old C defaults to int if no variable type is given.
- no void is required for main in some version of C.
- try to avoid if's. You can use ?: or || and && instead.
*/

s,u,e,y,f=21,x=1;
float c(x)
{
        for(s=0,y=x;y>0;y--)
                s+=x%y?0:y;
        return(float)s/x;
}

main()
{
        while(f)
                for(e=++x;e++<1200;)
                        c(x)-c(e)||(printf("%d,%d\n",x,e),f--,e=1200);
}