How to find a minimum value that calculated from a formulation?

Hi, Now, i have some parameters that range into a region. And i have a formulation that calculated form these parameters. (below code) And i want to find minimum value of the formulation that has to satisfy a condition. And i want to display that minimum value and coresponding values of parameters above. Help me, plesea. Thank you so much. My code:

x=(50:100);
y=(50:100);
z=(15:50);
Mu=4000;
Mrmin=0;
for i=1:51
    for j=1:51
        for k=1:36
            Mr = x(i)*y(j)*z(k);
            if Mr >= Mu
               Mrmin = Mr;
            end   
        end
    end
end

Answer 1

[Torsten]

x=(50:100);
y=(50:100);
z=(15:50);

Mrmin=Inf;
Mu=4000;
imin=1;
jmin=1;
kmin=1;
for i=1:51
    for j=1:51
        for k=1:36
            Mr = x(i)*y(j)*z(k);
            if (Mr <= Mrmin) && (Mr >= Mu) 
               Mrmin = Mr;
               imin = i;
               jmin = j;
               kmin = k;
            end   
        end
    end
end

Best wishes

Torsten.

[Le Dung]

Thank you so much, Torsten.

Answer 2

[Niels]

x=(50:100);
y=(50:100);
z=(15:50);

Mrmin=Inf;
for i=1:51
    for j=1:51
        for k=1:36
            Mr = x(i)*y(j)*z(k);
            if Mr <= Mrmin && Mr>4000
               Mrmin = Mr;
            end   
        end
    end
end

[Le Dung]

Thank you so much, Niels.