#1

var

x,y,z : integer;

a : real;

begin

readln(x,y,z);

a := ((x + y - z)/(x*x + 2));

writeln(a);

end.

#2

var

x,y,z : integer;

a : real;

begin

readln(x,y,z);

a := 5*((2*x-z)/(3+y*y));

writeln(a);

end.

#3

var

x,y,z : integer;

a : real;

begin

readln(x,y,z);

a := (1 + z)*((x+(y/x*x+4))/(2+(1/(x*x+4))));

writeln(a);

end.

#2.1

const pi = 3.14;

var

l,s,r : real;

begin

readln(r);

l := 2 * pi * r;

s := pi * r * r;

writeln(l);

writeln(s);

end.

#2.2

var

x : real;

begin

readln(x);

writeln((180 - x)/2);

end.