diff --git a/day09.py b/day09.py
index 8faa0d5..cce1adf 100644
--- a/day09.py
+++ b/day09.py
@@ -15,8 +15,8 @@ def part1(test_mode=False):
         current_buffer_size = len(number_buffer)
         if current_buffer_size == max_buffer_size:
             found_sum = False
-            for combination in itertools.combinations(number_buffer, 2):
-                if sum(combination) == number:
+            for check_number in number_buffer:
+                if number - check_number in number_buffer:
                     found_sum = True
                     break
 
@@ -36,10 +36,11 @@ def part2(test_mode=False):
 
     for start_index in range(0, len(my_input)):
         for stop_index in range(start_index + 1, len(my_input) - start_index - 1):
-            if my_input[stop_index] == sum_to_find:
+            thisSum = sum(my_input[start_index:stop_index])
+            if thisSum > sum_to_find:
                 break
 
-            if sum(my_input[start_index:stop_index]) == sum_to_find:
+            if thisSum == sum_to_find:
                 return min(my_input[start_index:stop_index]) + max(my_input[start_index:stop_index])
 
     return 0