Working out replenishing levels from customer demand using a Maximum Stock level

Hello All

C6 – G6 is Customer demand
C7 –G6 is how man boxes are needed to cover the customer demand
H6 – Maximum Stock holding

Is there a formula that will look at the customer demand in blue and work out what day the maximum stock will need topping up?

Tuesday to Friday uses the maximum stock of 600, so Monday is short of 200 hence the – 10 in G6

Paul