diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..3fc62a0
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,96 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "itoa"
+version = "1.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "49f1f14873335454500d59611f1cf4a4b0f786f9ac11f4312a78e4cf2566695b"
+
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+
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+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "qalc-rs"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
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+ "proc-macro2",
+]
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+ "serde_derive",
+]
+
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+name = "serde_derive"
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+ "itoa",
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+ "ryu",
+ "serde",
+]
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+ "proc-macro2",
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+ "unicode-ident",
+]
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diff --git a/Cargo.toml b/Cargo.toml
index d288cd5..08250b1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,5 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+serde = { version = "1.0.213", features = ["derive"] }
+serde_json = "1.0.132"
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..02bfbeb 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,39 @@
-fn main() {
-    println!("Hello, world!");
+use std::collections::HashMap;
+use std::fs;
+use std::io;
+
+fn memorised_words(word_counts: Vec<HashMap<String, i32>>, ranges: Vec<&str>) -> i32 {
+    let mut total_memorised: i32 = 0;
+
+    for word_count in word_counts {
+        for &range in &ranges {
+            match word_count.get(range) {
+                Some(length) => {
+                    total_memorised += length
+                },
+                None => {},
+            }
+        }
+    }
+
+    total_memorised
+}
+
+fn main() {
+    let file_data = fs::read_to_string("data.json").expect("Unable to read file");
+    let word_counts: Vec<HashMap<String, i32>> = serde_json::from_str(&file_data).expect("Could not parse JSON data");
+    
+
+    // Read input from standard input
+    let mut input = String::new();
+    io::stdin()
+        .read_line(&mut input)
+        .expect("Failed to take in ranges");
+
+    input.pop();
+    let ranges: Vec<&str> = input.split(",").collect();
+
+    let total_memorised = memorised_words(word_counts, ranges);
+
+    println!("{}", total_memorised);
 }