diff --git a/assignments/chapter_1-3/crypto_mining/.gitignore b/assignments/chapter_1-3/crypto_mining/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/assignments/chapter_1-3/crypto_mining/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/assignments/chapter_1-3/crypto_mining/Cargo.lock b/assignments/chapter_1-3/crypto_mining/Cargo.lock
new file mode 100644
index 0000000..88cd432
--- /dev/null
+++ b/assignments/chapter_1-3/crypto_mining/Cargo.lock
@@ -0,0 +1,244 @@
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diff --git a/assignments/chapter_1-3/crypto_mining/Cargo.toml b/assignments/chapter_1-3/crypto_mining/Cargo.toml
new file mode 100644
index 0000000..95a4e0b
--- /dev/null
+++ b/assignments/chapter_1-3/crypto_mining/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "crypto_mining"
+version = "0.1.0"
+edition = "2024"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rand = "0.9.0"
diff --git a/assignments/chapter_1-3/crypto_mining/src/main.rs b/assignments/chapter_1-3/crypto_mining/src/main.rs
new file mode 100644
index 0000000..5ebb280
--- /dev/null
+++ b/assignments/chapter_1-3/crypto_mining/src/main.rs
@@ -0,0 +1,57 @@
+use rand::Rng;
+use std::{io, time};
+
+fn main() {
+    let number = loop {
+        println!("Please input your a number.");
+
+        let mut number = String::new();
+
+        io::stdin()
+            .read_line(&mut number)
+            .expect("Failed to read line");
+
+        match number.trim().parse() {
+            Ok(num) => break num,
+            Err(_) => continue,
+        };
+    };
+
+    let mut loop_iteration_counter = 0u64;
+    const NUMBER_OF_RUNS: usize = 100;
+    let mut times = [0.0; NUMBER_OF_RUNS];
+    let mut rng = rand::rng();
+    for i in 0..NUMBER_OF_RUNS {
+        let now = time::Instant::now();
+        let mut vector_of_random_numbers: Vec<f32> = Vec::new();
+        for _ in 0..number {
+            let random_float: f32 = rng.random();
+            vector_of_random_numbers.push(random_float);
+        }
+        dbg!(vector_of_random_numbers.len());
+        dbg!(&vector_of_random_numbers);
+        loop {
+            loop_iteration_counter += 1;
+            let random_float: f32 = rng.random();
+            if vector_of_random_numbers.len() == 0 {
+                break;
+            }
+            match vector_of_random_numbers
+                .iter()
+                .position(|number_in_vec| random_float == *number_in_vec)
+            {
+                Some(index) => vector_of_random_numbers.remove(index),
+                None => continue,
+            };
+        }
+        times[i] = now.elapsed().as_secs_f64();
+        println!(
+            "Instance: {}\tIterations: {}\tTime taken: {}s",
+            i,
+            loop_iteration_counter,
+            now.elapsed().as_secs_f64()
+        );
+    }
+    dbg!(&times);
+    dbg!(times.iter().sum::<f64>() / NUMBER_OF_RUNS as f64);
+}