Matlab-Number of distinct elements in a matrix

Write a script program to display the number of distinct elements in a matrix?

n=input('Enter number of rows you want in matrix:\n');

m=input('Enter number of columns you want in the matrix:\n');

a=input('Enter a matrix:');

r=1;

c=1;

count=0;

b=reshape(a,1,n*m);

while c<m*n

    if b(1,c)~=b(1,c+1)

        count=count+1;

    end

    c=c+1;

end

disp(count);

OUTPUT

Enter number of rows you want in matrix:

2

Enter number of columns you want in the matrix:

3

Enter a matrix:[1,1,2;3,4,5]

     5