module sum4 (a, b, c, d, e, sum1, sum2, sum3);
  input  [31:0]   a, b, c, d, e;
  output [31:0]   sum1, sum2, sum3;
  wire   [31:0]   a_plus_b;

  assign a_plus_b = a + b;
  assign sum1 = a_plus_b + c;
  assign sum2 = a_plus_b + d;
  assign sum3 = a_plus_b + e;
  // Genera 4 sumadores
endmodule