uses crt;
var i,s:integer;
begin
for i:=1 to 50 do writeln(*);
s:=0;
For i:=1 to 99 do while i mod 2 = 1 do s:=s+i;
writeln('tong cua phep tinh la',s); readln;
end.
uses crt;
var i,t:integer;
begin
clrscr;
for i:=1 to 50 do
write('*');
writeln;
t:=0;
for i:=1 to 100 do
if i mod 2=1 then t:=t+i;
writeln(t);
readln;
end.