Update app.py

app.py

@@ -68,6 +68,7 @@ def kmeans(ligend,n_clusters,n_num):
     pdb_folder = pathlib.Path(__file__).parent.joinpath("temp")
     ligend_path = ligend.name
     shutil.copy(ligend_path,pdb_folder)
+    n_num = int(n_num)
     for i in range(1,n_num+1):
         if i == 1:
             add_file_to_folder(peptide_folder_path,pdb_folder)