diff --git a/day07/src/main.rs b/day07/src/main.rs
index ad37050..e03bad0 100644
--- a/day07/src/main.rs
+++ b/day07/src/main.rs
@@ -153,8 +153,9 @@ fn main() -> Result<(), Box<dyn error::Error>> {
 
 	// compute sizes
 	let sizes = fs_tree.get_dir_sizes();
-	println!("{}", sizes.iter().filter(|x| **x < 100000).sum::<u32>());
-
-    println!("Hello, world!");
+	let full_space = 70000000;
+	let free_space = full_space - sizes[sizes.len() - 1];
+	let needed_space = 30000000 - free_space;
+	println!("{}", sizes.iter().filter(|x| **x > needed_space).min().unwrap());
     Ok(())
 }