The story of high school students, talented Jan and Karel, who has a problem with math. Their life affects pedantic professor of mathematics Klec, that goes with them on a school trip, which escalates the conflict between them. Jan wants to escape, but Professor Donat will discourage him. Karel fails the exam of mathematics and decides to commit suicide.
| Actor | Role |
|---|---|
 Jindřich PlachtaKleč | Kleč |
 František SmolíkDonát | Donát |
 Antonín NovotnýJan Šimon | Jan Šimon |
 Miroslav SvobodaKarel Kafka | Karel Kafka |
 Gustav HilmarKafka | Kafka |
 Eliška PleyováJansová | Jansová |
 Věra GabrielováMarta | Marta |
| ZZora MyslivečkováEva | Eva |
 Bedřich VrbskýNot listed | Not listed |
| BBohdan LachmanNot listed | Not listed |
| FFerdinand JarkovskýNot listed | Not listed |
| FFrantišek V. KučeraNot listed | Not listed |
| VViktor NejedlýNot listed | Not listed |
| MMirko EliášNot listed | Not listed |
| KKarel PostraneckýNot listed | Not listed |
 Bolek PrchalNot listed | Not listed |
 Bohumil ŠmídaNot listed | Not listed |
 Elmar KlosNot listed | Not listed |
 František ČápNot listed | Not listed |
 Jiří VondrovičNot listed | Not listed |
| OOta KučeraNot listed | Not listed |
| JJan VyskočilNot listed | Not listed |
| MMiloš MidlochNot listed | Not listed |
| FFrantišek SádekNot listed | Not listed |
| JJarka ŽenatýNot listed | Not listed |
| VVladimír NovotnýNot listed | Not listed |
 Vladimír ČechNot listed | Not listed |
 František FilipovskýNot listed | Not listed |
| JJosef PicekNot listed | Not listed |
| AAnatanas VarnasNot listed | Not listed |