 Hi again, for today's lesson we have two simple challenges. First challenge is to write a function which will increment a given number. So let's make a function, let's call it increment. And let's put inside it as parameter some number. Now what we want to do is to increment this number and to return it. So we will return this number plus one. Okay, let's try our function increment, let's increment number five. And the returning value will be number six because five plus one is six. And now let's write another function. At this point I think that you could write it by your own, write a function which will decrement a given number. Well it's very easy, it's easy enough and it's very lookalike this function, but now instead of adding number one we want to subtract number one from a given number. So let's make a function decrement with again some given number and we want to return that same number minus one. Let's try if our function is well defined, let's decrement number six and returning value will be number five because six minus one equals two five. That's all in this challenge, thanks for watching, bye-bye.