diff --git a/input.txt b/input.txt
new file mode 100644
index 0000000..29d80bf
--- /dev/null
+++ b/input.txt
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diff --git a/src/main.rs b/src/main.rs
index e7a11a9..3434d6c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,21 @@
 fn main() {
-    println!("Hello, world!");
+    let args: Vec<String> = std::env::args().collect();
+    let file_path = args
+        .get(1)
+        .expect("Please provide an argument on command-line.");
+    let contents =
+        std::fs::read_to_string(file_path).expect("Please provide a text file as an argument.");
+    let lines: Vec<&str> = contents.split("\n").collect();
+
+    let mut max = 0;
+    let mut accumulated = 0;
+    lines.iter().for_each(|number| {
+        if let Ok(yay) = number.parse::<i32>() {
+            accumulated += yay;
+        } else {
+            max = max.max(accumulated);
+            accumulated = 0;
+        }
+    });
+    println!("{max}");
 }