Maybe Null is not to blame?

«Maybe Null is not to blame?» – a funny story by Irina Tokmakova about the adventures of schoolchildren Ali and Anton, who miraculously found themselves in a mathematics textbook. The curious kids set off in search of a missing soldier, without which it is impossible to solve the problem. Along the way, Ali and Anton will encounter many interesting things; they will meet numbers and learn to add and subtract.