diff --git a/5/pp/README.md b/5/pp/README.md
new file mode 100644
index 0000000..e15754d
--- /dev/null
+++ b/5/pp/README.md
@@ -0,0 +1 @@
+# Parallel Programming
diff --git a/5/pp/rayon_demo/.gitignore b/5/pp/rayon_demo/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/5/pp/rayon_demo/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/5/pp/rayon_demo/Cargo.lock b/5/pp/rayon_demo/Cargo.lock
new file mode 100644
index 0000000..b88ce83
--- /dev/null
+++ b/5/pp/rayon_demo/Cargo.lock
@@ -0,0 +1,200 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
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+ "crossbeam-epoch",
+ "crossbeam-utils",
+]
+
+[[package]]
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+ "crossbeam-utils",
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+ "cfg-if",
+ "libc",
+ "r-efi",
+ "wasip2",
+]
+
+[[package]]
+name = "libc"
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+[[package]]
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+ "zerocopy",
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+[[package]]
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+ "unicode-ident",
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+[[package]]
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+ "proc-macro2",
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+[[package]]
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+[[package]]
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+ "rand_chacha",
+ "rand_core",
+]
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+[[package]]
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+ "rand_core",
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+[[package]]
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+ "getrandom",
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+[[package]]
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+ "either",
+ "rayon-core",
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+[[package]]
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+dependencies = [
+ "crossbeam-deque",
+ "crossbeam-utils",
+]
+
+[[package]]
+name = "rayon_demo"
+version = "0.1.0"
+dependencies = [
+ "rand",
+ "rayon",
+]
+
+[[package]]
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+ "proc-macro2",
+ "quote",
+ "unicode-ident",
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+dependencies = [
+ "zerocopy-derive",
+]
+
+[[package]]
+name = "zerocopy-derive"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
diff --git a/5/pp/rayon_demo/Cargo.toml b/5/pp/rayon_demo/Cargo.toml
new file mode 100644
index 0000000..930afce
--- /dev/null
+++ b/5/pp/rayon_demo/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "rayon_demo"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+rand = "0.9.2"
+rayon = "1.11.0"
diff --git a/5/pp/rayon_demo/README.md b/5/pp/rayon_demo/README.md
new file mode 100644
index 0000000..516f73e
--- /dev/null
+++ b/5/pp/rayon_demo/README.md
@@ -0,0 +1,20 @@
+# Rayon Demo
+
+Second additional task for the Parallel Programming class. Shows how effortlessly [rayon](https://github.com/rayon-rs/rayon) speedups the workloads.
+
+Launch with:
+```bash
+cargo run --release
+```
+
+Execution result (CPU with 8 cores):
+```
+Генерування 10000000 випадкових чисел...
+Початок тестування...
+
+Послідовно: знайдено 472801 простих чисел за 34.234398653s
+Паралельно: знайдено 472801 простих чисел за 4.742153237s
+
+Прискорення: 7.22x
+```
+
diff --git a/5/pp/rayon_demo/src/main.rs b/5/pp/rayon_demo/src/main.rs
new file mode 100644
index 0000000..13cc877
--- /dev/null
+++ b/5/pp/rayon_demo/src/main.rs
@@ -0,0 +1,50 @@
+use rayon::prelude::*;
+use std::time::Instant;
+
+// Функція для перевірки числа на простоту (навантаження CPU)
+fn is_prime(n: u32) -> bool {
+    if n <= 1 {
+        return false;
+    }
+    for i in 2..=(f64::from(n).sqrt() as u32) {
+        if n.is_multiple_of(i) {
+            return false;
+        }
+    }
+    true
+}
+
+fn main() {
+    // Підготовка даних
+    let data_size = 10_000_000;
+    println!("Генерування {data_size} випадкових чисел...");
+
+    // Тут теж використано Rayon для швидкої генерації
+    let numbers: Vec<u32> = (0..data_size)
+        .into_par_iter()
+        .map(|_| rand::random::<u32>())
+        .collect();
+
+    println!("Початок тестування...\n");
+
+    // Послідовне виконання
+    let start_seq = Instant::now();
+    let count_seq = numbers.iter().filter(|&&x| is_prime(x)).count();
+    let duration_seq = start_seq.elapsed();
+
+    println!("Послідовно: знайдено {count_seq} простих чисел за {duration_seq:?}");
+
+    // Паралельне виконання з Rayon
+    let start_par = Instant::now();
+    let count_par = numbers
+        .par_iter() // Вся магія тут
+        .filter(|&&x| is_prime(x))
+        .count();
+    let duration_par = start_par.elapsed();
+
+    println!("Паралельно: знайдено {count_par} простих чисел за {duration_par:?}");
+
+    // Висновок
+    let speedup = duration_seq.as_secs_f64() / duration_par.as_secs_f64();
+    println!("\nПрискорення: {speedup:.2}x");
+}