#!/bin/bash
MAXFILES="$1"

FILENUM="1"
PARTNUM="1"
for file in *; do
  if [ "$FILENUM" -gt "$MAXFILES" ]; then
    FILENUM="1"
    let "PARTNUM++"
  fi
  DIRNAME="Part$(printf "%.2d" "$PARTNUM")"
  [ ! -d "$DIRNAME" ] && mkdir -p "$DIRNAME"
  mv "$file" "$DIRNAME"
  let "FILENUM++"
done