program chisla;

var summa,n,y,i:longint;

begin

  writeln('daite N'); readln(n);

  for i:=1 to n do summa:=summa+i;

  {etot tikl dayot summu dlya nomera N, primer: n=5, summa=1+2+3+4+5=15;}

  y:=(n+1)/2;

  if y>summa then writeln('Y > summa N ') else

  if y=summa then writeln('Y = summa N') else writeln('Y < summa');

readln;

end.

ya tak ponyal zadachu, esli ne tak, proshu popraviti. spasibo