1.1.

var x, y, z: real;

begin

readln(x, y, z);

writeln((x + y - z)/(x * x + 2));

end.

1.2.

var x, y, z: real;

begin

readln(x, y, z);

writeln(5 * (2 * x - z)/(3 + y * y));

end.

1.3.

var x, y, z: real;

begin

readln(x, y, z);

writeln((1 + z) * (x + y / (x * x + 4))/(2 + 1/(x * x + 4)));

end.

2.1.

var r: real;

begin

read(r);

writeln(2 * pi * r);

writeln(pi * r * r);

end.

2.2

var a: real;

begin

read(a);

writeln((180 - a) / 2);

end.