program z795;
uses crt;
const n=5;
var a:array[1..n] of integer;
b:array[1..n] of integer;
i:integer;
BEGIN
clrscr;
randomize;
for i:=1 to n do begin
a[i]:=random(50)-20;
write(a[i]:7); end;
for i:=1 to n do begin
if odd(i) then b[i]:=-a[i]
else b[i]:=i*a[i];
write(b[i]:7);end;
readln;
END.