N = 5;
a = [];
s = 0;
for (j=0; j<N; j++)
{ a[j] = Math.round(Math.random()*20);
  b = a[j];
  while (b > 0)
  { s += b%10;
    b = (b-b%10)/10;
  }
}
console.log(a);
console.log(s);