diff --git a/src/main.rs b/src/main.rs
index bbb5865..8c35698 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -22,7 +22,8 @@ fn validate_grading_system() {
 
 /// Calculate the grade
 fn calculate_grade(carrots: i32, nuts: i32, seeds: i32) -> i32 {
-    todo!()
+    let final_grade = (carrots + nuts) * (carrots + nuts + seeds);
+    return final_grade;
 }
 
 /// Validate the safety system
@@ -49,7 +50,17 @@ fn calculate_safety_status(
     has_carrot: bool,
     friends_nearby: i32,
 ) -> bool {
-    todo!()
+    return if day_time && !wolves_nearby {
+        true
+    } else {
+        if has_carrot {
+            true
+        } else if friends_nearby > 3 {
+            true
+        } else {
+            false
+        }
+    };
 }
 
 /// Validate the simulation
@@ -67,7 +78,19 @@ fn validate_simulation() {
 
 /// Simulate the rabbit population
 fn simulate(starting_rabbits: i128) -> i32 {
-    todo!()
+    let mut rabbits = starting_rabbits;
+    let mut count = 0;
+
+    while rabbits > 1 {
+        if rabbits % 2 == 0 {
+            rabbits = rabbits / 2;
+        } else {
+            rabbits = (rabbits * 3) + 1;
+        }
+        count += 1;
+    }
+
+    return count;
 }
 
 #[cfg(test)]