Well it depends on the size of the cans of tuna, how much f/f mayo and how much sweet relish you use:
3 cans of tuna(water packed) = per
Calorie King 1 can is 191 cal/1 fat or 4 points and this may vary
1 red apple = 1 point
sweet relish(pickle) =
4 egg whites = 1 point per
Calorie King 4 tablespoons is 78 cal/0 fat/0 fiber or 2 points
FF mayonaise = per
Calorie King 4 tablespoons is 40 cal/0 fat/0 fiber or 1 point
Total up what you use and divide by the number of servings.