I built a time machine in 2018. A time machine has a default range of up to 20 years into the future and 30 years into the Past. I programmed the machine and went back 15 years. After spending a year in the past, I used it again and it's gone 10 years into the future. There I spent around two years and used the machine again to go to the future 6 years ahead. In which year did I land up?