3. Given two integers: n and m and n is divisible by 2m, you have to first write down the first 13 n natural numbers in the following form: 1. At first take first m integers and make their sign negative 2. Then take next m integers and make their sign positive / 3. The next m integers should have negative signs and continue this procedure until all the n integers have been assigned a sign. For example, let n be 12 and m be 3 . Then we have 123+4+5+6789+10+11+ 12. If n=4 and m=1, then we have 1+23+4. Now your task is to find the summation of the numbers considering their signs