diff --git a/0410-1A/task1-appendsort/Cargo.toml b/0410-1A/task1-appendsort/Cargo.toml
new file mode 100644
index 0000000..523f49c
--- /dev/null
+++ b/0410-1A/task1-appendsort/Cargo.toml
@@ -0,0 +1,9 @@
+[package]
+name = "task1-appendsort"
+version = "0.1.0"
+authors = ["inga-lovinde <52715130+inga-lovinde@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/0410-1A/task1-appendsort/src/main.rs b/0410-1A/task1-appendsort/src/main.rs
new file mode 100644
index 0000000..23d02ff
--- /dev/null
+++ b/0410-1A/task1-appendsort/src/main.rs
@@ -0,0 +1,161 @@
+use std::{cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd}, io::{self, BufRead}, ops::{Add, Index, Shl}};
+
+#[derive(Debug)]
+struct BigInt {
+    storage: Vec<u8>,
+}
+
+impl BigInt {
+    fn size(&self) -> usize {
+        self.storage.len()
+    }
+}
+
+impl Index<usize> for BigInt {
+    type Output = u8;
+    fn index(&self, offset: usize) -> &u8 {
+        if offset < self.storage.len() {
+            return &self.storage[offset];
+        } else {
+            return &0;
+        }
+    }
+}
+
+impl Add for &BigInt {
+    type Output = BigInt;
+
+    fn add(self, other: Self) -> BigInt {
+        let mut result = vec![0; self.size().max(other.size())];
+        let mut carry = 0;
+        for i in 0..result.len() {
+            let mut digit = self[i] + other[i] + carry;
+            if digit >= 10 {
+                digit -= 10;
+                carry = 1;
+            } else {
+                carry = 0;
+            }
+            result[i] = digit;
+        }
+
+        if carry > 0 {
+            result.push(carry);
+        }
+
+        BigInt {
+            storage: result,
+        }
+    }
+}
+
+impl Shl<usize> for &BigInt {
+    type Output = BigInt;
+
+    fn shl(self, rhs: usize) -> BigInt {
+        let mut result = vec![0; rhs];
+        result.extend_from_slice(&self.storage);
+
+        BigInt {
+            storage: result,
+        }
+    }
+}
+
+impl PartialEq for BigInt {
+    fn eq(&self, other: &Self) -> bool {
+        for i in 0..self.size().max(other.size()) {
+            if self[i] != other[i] {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}
+
+impl Eq for BigInt {
+}
+
+impl Ord for BigInt {
+    fn cmp(&self, other: &Self) -> Ordering {
+        for i in (0..self.size().max(other.size())).rev() {
+            //println!("{} {}", self[i], other[i]);
+            let comparison = self[i].cmp(&other[i]);
+            if comparison != Ordering::Equal {
+                //println!("{:?}", comparison);
+                return comparison;
+            }
+        }
+
+        return Ordering::Equal;
+    }
+}
+
+impl PartialOrd for BigInt {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl From<u32> for BigInt {
+    fn from(mut num: u32) -> BigInt {
+        let mut result = vec![];
+
+        while num > 0 {
+            result.push((num % 10) as u8);
+            num = num / 10;
+        }
+
+        BigInt {
+            storage: result,
+        }
+    }
+}
+
+fn get_next_value(previous_value: &BigInt, current_value: &BigInt) -> (BigInt, usize) {
+    let current_value_plus = current_value + (&BigInt::from(1));
+    let previous_value_plus = previous_value + (&BigInt::from(1));
+
+    //println!("{:?} {:?} {:?} {:?}", previous_value, current_value, previous_value_plus, current_value_plus);
+    for shift in 0..10000usize {
+        let current_value_shifted = current_value << shift;
+        let current_value_plus_shifted = (&current_value_plus) << shift;
+        //println!("{:?} {:?}", current_value_shifted, current_value_plus_shifted);
+
+        if (&current_value_shifted) > previous_value {
+            return (current_value_shifted, shift);
+        }
+
+        if (&current_value_plus_shifted) > (&previous_value_plus) {
+            return (previous_value_plus, shift);
+        }
+    }
+
+    panic!("too large shift");
+}
+
+fn solve(list: Vec<u32>) -> usize {
+    let mut result = 0;
+
+    let mut last_value = BigInt::from(0);
+    for current_num in list {
+        let (next_value, shift) = get_next_value(&last_value, &BigInt::from(current_num));
+        last_value = next_value;
+        result += shift;
+    }
+
+    result
+}
+
+fn main() {
+    let stdin = io::stdin();
+    let mut lines = stdin.lock().lines();
+
+    let test_number: u32 = lines.next().unwrap().unwrap().parse().unwrap();
+    for t in 1..=test_number {
+        let _length: u32 = lines.next().unwrap().unwrap().parse().unwrap();
+        let list: Vec<u32> = lines.next().unwrap().unwrap().split(char::is_whitespace).map(|part| part.parse().unwrap()).collect();
+        println!("Case #{}: {}", t, solve(list));
+    }
+}