diff --git a/src/calc.rs b/src/calc.rs
index c8bea0c..6fef4f1 100644
--- a/src/calc.rs
+++ b/src/calc.rs
@@ -1,7 +1,7 @@
 use std::io::Error;
 
 #[derive(Clone)]
-struct CalcNode {
+pub struct CalcNode {
     item: Item,
     left: Option<Box<CalcNode>>,
     right: Option<Box<CalcNode>>,
@@ -35,9 +35,17 @@ impl CalcTree {
     }
     pub fn insert(&mut self, item: Item) {
         use Item::*;
-        if let Oper(_) = item {
+        if let Oper(operation) = &item {
             match &self.root.item {
-                Num(_) => self.root = CalcNode::new(item, Some(Box::new(self.root.clone())), None),
+                Num(_) => {
+                    if matches!(*operation, Operation::Div) || matches!(*operation, Operation::Mult)
+                    {
+                        let inserted = CalcNode::new(item, self.root.right.clone(), None);
+                        self.root.right = Some(Box::new(inserted));
+                    } else {
+                        self.root = CalcNode::new(item, Some(Box::new(self.root.clone())), None);
+                    }
+                }
                 Oper(_) => panic!("fuck off"),
             }
         } else {
@@ -55,4 +63,39 @@ impl CalcTree {
             }
         }
     }
+    pub fn resolve(root: &CalcNode) -> Item {
+        use Item::*;
+        if let Oper(operation) = &root.item {
+            let mut a: i32 = 0;
+            let mut b: i32 = 0;
+            if let Some(node) = &root.left {
+                match node.item {
+                    Num(value) => a = value,
+                    Oper(_) => {
+                        if let Num(value) = CalcTree::resolve(&node) {
+                            a = value
+                        }
+                    }
+                }
+            }
+            if let Some(node) = &root.right {
+                match node.item {
+                    Num(value) => b = value,
+                    Oper(_) => {
+                        if let Num(value) = CalcTree::resolve(&node) {
+                            b = value
+                        }
+                    }
+                }
+            }
+            match operation {
+                Operation::Add => Num(a + b),
+                Operation::Sub => Num(a - b),
+                Operation::Div => Num(a / b),
+                Operation::Mult => Num(a * b),
+            }
+        } else {
+            root.item.clone()
+        }
+    }
 }