diff --git a/diy1.py b/diy1.py
index 0735a44..cd9403a 100644
--- a/diy1.py
+++ b/diy1.py
@@ -1,5 +1,12 @@
 #定义一个函数sum_numbers()
 #要求这个函数能接收一个名为num的整型参数
 #要求这个函数能计算1+2+3+……+num的结果
-
-
+def sum_numbers(num):
+    if num==1:
+        return 1
+    result=num+sum_numbers(num-1)
+    return result
+    
+number=50
+res=sum_numbers(number)
+print("1到"+str(number)+"和是:"+str(res))