1000 Calorie diet but going to subway for food calorie question?

i really want to stick to my 1000 calories. but i want to get a subway 6 inch hoagie.. i am willing to skip breakfast + lunch so i dont go over my 1000 calories.. can i get ham cheese + mayo with out going over?1000 Calorie diet but going to subway for food calorie question?
According to the Subway link below, there are only 322 calories in that 6" ham and cheese sub. If you use oil and vinegar instead of mayonnaise, it will have fewer calories.