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# Get value in array by increments of three

I'm trying to write a calculator that uses a calculation of the number of months to get a value in an array. The problem is two-fold:

1. For the first 2 years, I move an extra space in the array for each start of the 3th month (so 0=array[0], 3=array[1], 6=array[2],... After that it changes each year, so 12 months to move through the next array value. I started to write if else statements for every value between two numbers but I was hoping a for loop for the first 2 years and one for the other 38 years could help me loop throught them.

```    /*for loop until 24 months (from then each year)*/
for(aEenheidsstatuut < 24) {};
/*get value from array*/
/*for loop from 24 months up to 480 months*/
for (aEenheidsstatuut >= 24) {};
/*get value from array*/
```
2. When I get the for loop, how do I write the statement in the first one to get to every third month (for example round down to number divisable by 3?) and make echt next number get to the next array. And in the second case each number rounded down divisable by 12.