formula packaging optimisation

Hello

I have a project to optimize the calculation of the necessary packaging product A is made available in 1000kg, 200kg, 2.5kg

If I have 1346kg of product for sale I want to optimize the packaging (1x1000kg + 1x200 + 59x2.5kg)=> total 1347.5kg

My formula is as follows I type my number of kg in box B2 say 1346

A5: 1000 B5: =INT(C3/A5) ===>1

A6: 200 B6: =INT(MOD(C3,A5)/A6) ===>1

A7: 2.5 B7: =IF(INT(MOD(MOD(C3,A5),A6)/A7)>=0,INT(MOD(MOD(C3,A5),A6)/A7)+1,INT(MOD (MOD(C3,A5),A6)/A7)) ===>59

now we have just integrated a new packaging of 50kg that I have to place between 200kg and 2.5kg and .... it becomes a hassle for me for the formula.

It may not look classy but could a good soul please help me on this point?

Thanks in advance