module count_bits(I, C);

   input   [31:0]  I;
   output  [5:0]   C;

   //
   // Please specify a synthesizable description of a circuit
   // that counts the number of bits that are set to '1' in
   // a 32-bit vector. e.g. "001101" should return '3'.
   //

   assign C = (((( I[0] +  I[1] +  I[2] +  I[3])   +
                 ( I[4] +  I[5] +  I[6] +  I[7]))  +
                (( I[8] +  I[9] + I[10] + I[11])   +
                 (I[12] + I[13] + I[14] + I[15]))) +
               (((I[16] + I[17] + I[18] + I[19])   +
                 (I[20] + I[21] + I[22] + I[23]))  +
                ((I[24] + I[25] + I[26] + I[27])   +
                 (I[28] + I[29] + I[30] + I[31]))));

endmodule