diff --git a/1667_houtao/Readme.md b/1667_houtao/Readme.md
new file mode 100644
index 0000000..2ff534f
--- /dev/null
+++ b/1667_houtao/Readme.md
@@ -0,0 +1,20 @@
+# 猴子吃桃子
+
+[问题描述]  
+
+教学案例，必须使用递归函数完成求解！  
+
+　　猴子吃桃子问题：猴子第一天摘下若干个桃子，当即吃了一半还不过瘾，又多吃了一个；第二天又将剩下的桃子吃掉一半又多吃了一个；以后每天早上都吃了前一天剩下的一半零一个。到了第n天想再吃时，见只剩下一个桃子，求第一天共摘了多少个桃子？  
+　　1 <= n <= 50  
+
+[输入格式]  
+　　一个整数值n。  
+
+[输出格式]  
+　　第一天的桃子总数量。  
+
+[输入样例]  
+3  
+
+[输出样例]   
+10
\ No newline at end of file
diff --git a/1667_houtao/doc/Readme.md b/1667_houtao/doc/Readme.md
new file mode 100644
index 0000000..4e768b5
--- /dev/null
+++ b/1667_houtao/doc/Readme.md
@@ -0,0 +1 @@
+# 
\ No newline at end of file
diff --git a/1667_houtao/main.cpp b/1667_houtao/main.cpp
new file mode 100644
index 0000000..b5c53a8
--- /dev/null
+++ b/1667_houtao/main.cpp
@@ -0,0 +1,15 @@
+#include <iostream>
+using namespace std;
+long long zhao(long long n){
+    if(n==1){
+        return 1;
+    }else{
+        return zhao(n-1)*2+2;
+    }
+}
+int main()
+{
+    int n;
+    cin>>n;
+    cout<<zhao(n);
+}
diff --git a/1667_houtao/main.exe b/1667_houtao/main.exe
new file mode 100644
index 0000000..492ea80
Binary files /dev/null and b/1667_houtao/main.exe differ
diff --git a/1667_houtao/test/in.txt b/1667_houtao/test/in.txt
new file mode 100644
index 0000000..e440e5c
--- /dev/null
+++ b/1667_houtao/test/in.txt
@@ -0,0 +1 @@
+3
\ No newline at end of file
diff --git a/1667_houtao/test/in2.txt b/1667_houtao/test/in2.txt
new file mode 100644
index 0000000..56a6051
--- /dev/null
+++ b/1667_houtao/test/in2.txt
@@ -0,0 +1 @@
+1
\ No newline at end of file
diff --git a/1667_houtao/test/in3.txt b/1667_houtao/test/in3.txt
new file mode 100644
index 0000000..c5b431b
--- /dev/null
+++ b/1667_houtao/test/in3.txt
@@ -0,0 +1 @@
+50
\ No newline at end of file
diff --git a/1667_houtao/test/out.txt b/1667_houtao/test/out.txt
new file mode 100644
index 0000000..460bdae
--- /dev/null
+++ b/1667_houtao/test/out.txt
@@ -0,0 +1,18 @@
+## z:\Chao\src\1667_houtao\test\in.txt 
+2020/04/30 周四 18:09:08.04 
+10
+-----------------------------------------------
+Process exited after 170 ms with return value 0
+
+## z:\Chao\src\1667_houtao\test\in2.txt 
+2020/04/30 周四 18:09:08.04 
+1
+-----------------------------------------------
+Process exited after 80 ms with return value 0
+
+## z:\Chao\src\1667_houtao\test\in3.txt 
+2020/04/30 周四 18:09:08.04 
+1688849860263934
+-----------------------------------------------
+Process exited after 90 ms with return value 0
+