Lemon Fruit Salad

1 Small pkg Lemon Pie filling
1 Can fruit cocktail drained
1 Can Mandarin Oranges drained
1 Can pineapple chunks drained
1 Cup mini marshmallows
1/2 pint Cool Whip

Prepare pie filling as directed on package. Chill. Fold in Cool Whip. Add fruit and Marshmallows. Let set