Make the first paragraph as the one of the longest and use each of the top three keywords one time. Use number 1 keyword as close to the first word as possible. Use the number two keyword somewhere in the second sentence but not later than the third sentence. Then you can use the number three keyword after the number 2.
Use the number 1 keyword one time within the first one third paragraph of the text in paragraph
2. If the paragraph is 100 words long make sure it is placed in the first 33 words. The conclusion is that the closer the keyword is to the beginning of paragraph the better it is.
Do the same as above using second keyword in paragraph three and number three keyword in paragraph four.
Now mix up the things and use one or more keyword anywhere in each paragraph. Do not use any single keyword more than three times total before reaching the final paragraph.
In the final paragraph do the exactly same as it is done in the first paragraph but in reverse order. Start with the least important keyword and end with the most important.
