var
i:integer;
v,r:real;
begin
r:=10;
for i:=1 to 12 do
r:=r+1;
r:=r/2;
v:=(4/3)*r*r*r*3.15;
v:=v/1000;
writeln(v);
readln;
end.
var
i:integer;
v,r:real;
begin
r:=10;
for i:=1 to 12 do
r:=r+1;
r:=r/2;
v:=(4/3)*r*r*r*3.15;
v:=v/1000;
writeln(v);
readln;
end.