diff --git a/lab4/src/main.rs b/lab4/src/main.rs
index adf2224..9a095cf 100644
--- a/lab4/src/main.rs
+++ b/lab4/src/main.rs
@@ -36,6 +36,7 @@ enum TrainingState {
 struct MyApp {
     model: ComparationOperatorsModel<7, 7, 8>,
     training: TrainingState,
+    hidden_layer_size: usize,
     n: f64,
     epochs_count: usize,
     symbols: [&'static str; 8],
@@ -48,6 +49,7 @@ impl Default for MyApp {
         return Self {
             model: ComparationOperatorsModel::new(imgs.1),
             training: TrainingState::NoTrain,
+            hidden_layer_size: 1,
             n: 0.1,
             epochs_count: 1,
             symbols: imgs.0,
@@ -78,6 +80,11 @@ impl eframe::App for MyApp {
     fn update(&mut self, ui: &eframe::egui::Context, _frame: &mut eframe::Frame) {
         egui::CentralPanel::default().show(ui, |ui| {
             ui.add_enabled_ui(matches!(self.training, TrainingState::NoTrain), |ui| {
+                _slider(ui, "Hidden layer size", &mut self.hidden_layer_size, 1..=49, 1f64);
+                if (self.hidden_layer_size != self.model.hidden_layer_size()) {
+                    self.model.resize_hidden_layer(self.hidden_layer_size);
+                }
+                ui.label("");
                 _slider(ui, "η", &mut self.n, 0.0..=1.0, 0.001);
                 ui.label("");
                 _slider(ui, "Epochs count", &mut self.epochs_count, 1..=500, 1f64);