program Project1;
 
    {$APPTYPE CONSOLE}
 
    uses
    SysUtils,
    Math;
 
    var
    a, b, c, d, x, y, z: Real;
    V: Real;
 
    begin
    Write('a=');
    Readln(a);
    Write('b=');
    Readln(b);
    Write('c=');
    Readln(c);
    Write('d=');
    Readln(d);
    Write('x=');
    Readln(x);
    Write('y=');
    Readln(y);
    Write('z=');
    Readln(z);
 
    if (sqr(c) <= sqr(x) + sqr(y) + sqr(z)) and
    (sqr(x) + sqr(y) + sqr(z) <= sqr(d))
    then
    begin
    V := a / max(x, max(y, z));
    Writeln('Перше обчислення');
    end;
 
    if sqr(x) + sqr(y) + sqr(z) <= sqr(c) then
    begin
    V := b / min(x, min(y, z));
    Writeln('Друге обчислення');
    end
    else
    begin
    V := (a + b) / 2;
    Writeln('Третє обчислення');
    end;
 
    Write(V);
    Readln;
    end.
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