Partitions of (5) = 7 [This is called the "Partition Function"]
5 = 5
4 + 1 = 5
3 + 2 = 5
3 + 1 + 1 = 5
2 + 2 + 1 = 5
2 + 1 + 1 + 1 = 5
1 + 1 + 1 + 1 + 1 = 5
You can put them in any order you want, such as: 1+1+3, 1+3+1, 3+1+1.....etc., and then count them.