docs: public void setNumExecutors(@Nonnegative int n) throws IOException, IllegalArgumentException {
          if (n < 0) {
              throw new IllegalArgumentException("Incorrect field \"# of executors\": " + n +". It should be a non-negative number.");
          }
          if (this.numExecutors != n) {
              this.numExecutors = n;
              updateComputerList();
              save();
          }
      }