Adding 1 to odd numbers and 2 to even values of a matrix in an m file in MATLAB

I want to add 1 to all the odd numbers and 2 to all of the even numbers of my matrix. I think you can use an if statement and a "mod" function, but I'm not sure how. can anyone help??

b= input('Enter a value for b');
c= input('Enter a value for c');
d= input('Enter a value for d');
e= input('Enter a value for e');

a= [b c; d e];

for i =1:2
    for j =1:2
        if i==1
            if j==1
            a(i,j)= a(i,j)+1;
            end
        end
         if i==1
             if j==2
                a(i,j)= a(i,j)+2;

               end
           end
           if i==2
               if j==1
                   a(i,j) = a(i,j)+3;
               end
           end
           if i==2
               if j==2
                   a(i,j) = a(i,j)+4;

                   a = [a(2,1),a(2,2);a(1,1),a(1,2)];   

               end
           end
      end
  end

Answer 1

[Walter Roberson]

M = magic(3);  %example matrix
M = M + 2 - mod(M,2);

[Sean de Wolski]

You win Sir!

Answer 2

[Sean de Wolski]

M = magic(3);  %example matrix
idx = ~mod(M,2);  %even places
M(idx) = M(idx)+2;  
M(~idx) = M(~idx)+1;

[Walter Roberson]

Order doesn't matter as idx is not going to change with the calculation.

[Sean de Wolski]

Very true. I didn't originally predefine idx.