I was highly interested in mathematics. It seemed to me to be a form of art, something very beautiful, geometry, mathematics, and the systematic way how it’s built and so on. But I was somewhat bored by most of other issues that were taught at school and I became at the age — from 13 maybe to 17, I was totally undisciplined and could not take any kind of discipline. So gradually I became a burden of the school. They asked me to go do something more productive maybe. I was — I don’t know, not hyperactive, I was a very shy introvert — but to do something useful to work in the field, rather than spend my time in interrupting others that want to study. So I was expelled from high school in the last year. I was allowed to come to listen to the math hours and I spent the rest of the day working until I joined the army at a very early age.