How to orginze perfect lottery where people never win anything - Amino KasaRomana TL;DR Knapsack; Kasa Romana; Algorithm To create a perfect lottery you have to hire a matematician who develop for you a perfect scenerio in which people always lose under simply rules and with feeling that winning might be very close. Rules: coupons with different values where cash in might be a set of them which sum to full hundreds (100, 200, ..., 900) Up to 1000. Algorithm to generate coupons values ... multiplication of 13 with optionally added 165. We have set of coupons like 91, 195, 299, 399, ..., 998 which never allow to win. For more info check the repo.