how to parallelize these three for-loops using openmp?

I am trying to make these three for-loops parallelized by using Openmp, i tried to add "#pragma omp parallel for" but it did not work. P.S: There no relation between these three for loops.

    for (i = 0; i < nblock; i++) ftab[eclass8[i]]++;

       for (i = 0; i < nblock; i++) {
          j = eclass8[i];
          k = ftab[j] - 1;
          ftab[j] = k;
          fmap[k] = i;
       }

  for (i = 0; i < s->nblock; i++)
      if (ptr[i] == 0)
         { s->origPtr = i; break; };