Add solution for problem 2
Add solution for problem 2

tborisova/euler,nerd-life/euler,tborisova/euler,nerd-life/euler,tborisova/euler,nerd-life/euler,nerd-life/euler,tborisova/euler,tborisova/euler,tborisova/euler,nerd-life/euler,tborisova/euler,nerd-life/euler,nerd-life/euler