c     rectangular  matrix 
c       multiplication
      dimension a(4,5), b(5,3)
      read 1,a,b
      read 1,n,m,l
    7 do 4 j=1,n
    1 do 4 i=1,m
    6 sum=0.0
    2 do 3 k=1,l
    3 sum = sum+a(i,k) * b(k,j)
    4 punch 1, sum, i,j
    8 end
