I need to make a simple subtraction/addition formula, but it's a tad bit complicated, atleast for me it is since im a novice at this program. I need the formula to subtract multiple cells and then add up the total from those subtracted numbers. Here's an example:

1: 200
2: 190
3: 180
total: 20

but lets say for example the number goes up:

1: 200
2: 190
3: 180
4: 185
total: 15

So the first number is the starting place, whether the following cell numbers go up or down I want it to keep track of the total progress. Any help is appreciated, thank you.