const
    N = 10;

var
    count, i : integer;
    a : array [1..N] of integer;
    geom : real;

begin
    count := 0;
    geom := 1.0;
    for i := 1 to N do begin
        readln(a[i]);
        if i mod 2 = 0 then begin
            inc(count);
            geom := geom * a[i];
        end;
    end;
    geom := power(geom, 1/count);
    writeln('Geometric mean is ', geom);
end.