diff --git a/pai9.rb b/pai9.rb
old mode 100644
new mode 100755
index f7cae5e..273d68a
--- a/pai9.rb
+++ b/pai9.rb
@@ -1,19 +1,31 @@
 #!/usr/bin/env ruby
 #-*- coding: utf-8 -*-
 
+puts("何回実行しますか?")
+kaisu = gets. chomp. to_i
 enshuritsu = 0.0
 x = 0
 
-while x < 10000000
+while x < kaisu
 
  y = 4 * x + 1
  
  z = 4 * x + 3
  
  enshuritsu = enshuritsu + (1.0 / y) - (1.0 / z).to_f
+
+ if x % (kaisu / 20) == 0
+   printf("%d回 円周率 %.20f\n",x,enshuritsu * 4.0)
+ end
+
  x = x + 1
+
+
+
 end
 
+
+
 printf("%d回 円周率 %.20f\n",x,enshuritsu * 4.0)