diff --git a/lab3_task1_funcation_block_arg/main.rb b/lab3_task1_funcation_block_arg/main.rb
index 6f150bb..c03b79e 100644
--- a/lab3_task1_funcation_block_arg/main.rb
+++ b/lab3_task1_funcation_block_arg/main.rb
@@ -43,6 +43,12 @@ def minimal_even_element(array)
 end
 
 
+def prime_divisors(number)
+    require 'prime'
+    (2..number).select { |x| number % x == 0 && Prime.prime?(x) }
+end
+
+
 # Ex
 array = [5, 3, 8, 1, 7]
 puts "Indices in order of decreasing elements:"
@@ -59,3 +65,7 @@ puts elements_between_first_and_last_max(array).join(", ")
 array = [5, 2, 8, 3, 7]
 puts "Minimal even element:"
 puts minimal_even_element(array)
+
+number = 28
+puts "Prime divisors:"
+puts prime_divisors(number).join(", ")