var
c : array [1..15] of real;
s : real;
i : byte;
begin
s := 1;
for i := 1 to 15 do read (a[i]);
for i := 1 to 15 do
if a[i] <> 0 then
s := s * a[i];
writeln (s);
end.
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uses GraphABC;
type point=record
x,y:integer;
end;
procedure plitk(x,y,r:integer);
var p:array[1..9]of point;
a,da:real;
i:byte;
begin
a:=pi/2;
da:=pi/4;
for i:=1 to 9 do
begin
p[i].x:=x+round(r*cos(a));
p[i].y:=y-round(r*sin(a));
a:=a+da;
end;
polygon(p,9);
end;
var r,i,j,x,y,d:integer;
begin
r:=20;
y:=r;
while y<=windowheight do
begin
x:=r;
while x<=windowwidth do
begin
plitk(x,y,r);
x:=x+2*r;
end;
y:=y+2*r
end;
end
var
c : array [1..15] of real;
s : real;
i : byte;
begin
s := 0;
for i := 1 to 15 do read (a[i]);
for i := 1 to 15 do
if a[i] <> 0 then
s := s * a[i];
writeln (s);
end.