How do I create a loop in which one variable doesn't increase until another has reached it's specified limit?

I am writing script to perform a block matching algorithm, I have 2 cell arrays (C&D) which contain parts of two images split into blocks, in part of the script the for loop below is used to compare each element of array D, to each one in array C, so D{1,1} is compared to every element of C and so on. When I run the script m,n&p both increase to their limits after the first loop and then m increases by one after each loop. Can someone explain how to alter the code so that after the first loop m&n are both at 1, and then after 6 loops n will have increased to 6, which will then cause m to increase to 2 in the next loop.

for m=1:5
     for n=1:6
         for o=1:5
             for p=1:6
                       savd(o,p)=calculateSAVD(D{1,n},C{o,p});
                       S{o,p}=savd; 
             end
         end
     end
end

Thanks in advance!