program Zada4a_13;

{$APPTYPE CONSOLE}
var
i,S,n:longint;
begin
write('N=');readln(n);
S:=0;
For i:=n to 100 do
if abs(i) mod 2=1 then
S:=S+SQR(i)*i;
writeln('S=',S);
readln;
end.