PROGRAMMING:average income

When he studied the economy of developed countries, he found that people's life in developed countries is not so happy. It is true that their average income is high, but this is because the local tyrants have raised their standard. The salary of ordinary people is not very different from that in China. Moreover, there are many more poor people, such as jobless, tramps, beggars and so on, than in China, and the overall average income can't be seen at all. So Hongge conceived a partial average model, which subdivided the income of each person and divided them into different levels: less than US $2000, less than US $4000 and less than US $6000 (annual income, even number, unit: US $1000). Then, according to the actual level of each country, he classified them into different levels (such as low-income, middle-income, high-income, etc.), Take a look at the average income of different levels, and then take a look at the proportion of people at these levels, so as to get a more objective criticism.
###Input format:
There is only one set of input data, which contains two positive integers n and m.
N means that there is a sequence of length n (n < = 100), which is defined as an increasing even number starting from 2.
M means to calculate an average value for each m number in order. If there are less than m numbers in the end, the average value will be calculated according to the actual number.
###Output format:
For the input data, an average value sequence is output, and each output occupies one line.
###Input example:
Here is a set of inputs. For example:
```in
3 2
```
###Output example:
The corresponding output is given here. For example:
```out
3 6
```







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