Program PascalGuru;
function f(u, t: real): real;
var
rez: real;
begin
if (u > 0) and (t > 0) then
rez := u + t;
if (u < 0) and (t < 0) then
rez := u + t;
if (u > 0) and (t < 0) then
rez := u - t;
if (u < 0) and (t > 0) then
rez := u + t;
f := rez;
end;
{ ---------------------------------- }
var
a, b, z: real;
begin
write('a= ');
readln(a);
write('b= ');
readln(b);
z := f(a, b) + f(a, b) + f(a - 1, b) + f(a - b, b) + f(a + b, b - 1);
writeln;
writeln('Z= ', z:0:2);
readln;
end.