Var
n, k, x: real;
begin
readln(n, k, x);
write('y = ');
if (k * (sqr(n) - sqr(k)) >= 2) then
writeln(exp(k * sqr(x)) - n * sqrt(x))
else
writeln(x*x*x + k * n * power(x, 1/3));
end.
const
k = 2;
m = 3;
var
x: real;
begin
readln(x);
write('F = ');
if ((x >= k + m) or ((k <= x) and (x <= m))) then<br> writeln((k + m) / (2 * x));
if ((x < K) or ((M < x) and (x < M + K))) then
writeln(3.5*power(10, -3)*(x / (k + m)));
end.