Program Z1;
const N=10;
var sum, i:integer;
a: array [1..N] of integer;
begin
sum := 0;
for i:=1 to N do
begin
readln(a[i]);
if a[i] < 0 then
sum := sum + a[i];
end;
sum := sum*sum;
writeln('sum= ',sum);
readln;
end.