diff --git a/src/main.rs b/src/main.rs
index 6af043d..dbf5c50 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -120,13 +120,14 @@ impl RoyaltyTree {
 	    }
 	self
         }
-    fn drill(&mut self, index: usize) {
+    fn get_royalty(&mut self, index: usize) -> FiNum {
         let mut f=self.forefather();
 	while f!=index {
 	    self.capture0(f);
 	    f=if f>index { wt_left(f).unwrap() } else { wt_right(f).unwrap() }
 	    }
 	self.capture0(f);
+	self.tree[index].acc
 	}
     fn capture(&mut self, index: usize) {
         let f=self.forefather();
@@ -155,9 +156,10 @@ impl RoyaltyTree {
     fn forefather(&self) -> usize {
         wt_forefather(self.tree.len()-1)
 	}
-    fn dump(&self) {
+    fn dump(&mut self) {
         for index in 0..self.tree.len() {
-	    println!("Index {} Weight {} Lazy {} Acc {}",index,self.tree[index].weight,self.tree[index].lazy,self.tree[index].acc);
+	    let roy=self.get_royalty(index);
+	    println!("Index {} Weight {} Lazy {} Acc {} Royalty {}",index,self.tree[index].weight,self.tree[index].lazy,self.tree[index].acc,roy);
 	    }
 	}
     }