diff --git a/1669_nweishu/Readme.md b/1669_nweishu/Readme.md
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+# 	1669	『入门』（递归专题）m位数问题
+
+[问题描述]  
+　　考官只给两个整数n和m（1 <= n <= 8，1 <= m <= 5），要求选手从1,2,…,n中取出m个数字，组成一个m位整数，统计所有的m位整数中一共有多少个素数。   
+　　如n=3,m=2时，符合条件的整数有：11 12 13 21 22 23 31 32 33。其中素数有：11 13 23 31，一共有4个。  
+
+[输入格式]  
+　　一行，两个整数n m，（1 <= n <= 8，1 <= m <= 5 ）。  
+
+[输出格式]  
+　　一行，一个整数，表示素数的个数。  　
+
+[输入样例]  
+3 2  
+
+[输出样例]  
+4  
diff --git a/1669_nweishu/doc/Readme.md b/1669_nweishu/doc/Readme.md
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+# 
\ No newline at end of file
diff --git a/1669_nweishu/main.cpp b/1669_nweishu/main.cpp
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+++ b/1669_nweishu/main.cpp
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+#include <iostream>
+#include <cmath>
+using namespace std;
+int shu,chang,flag=0,ans=0;
+bool pan(int n){
+    if(n<2){
+        return 0;
+    }
+    if(n==2){
+        return 1;
+    }
+    int len=sqrt(n);
+    for(int i=2;i<=len;i++){
+        if(n%i==0){
+            return 0;
+        }
+    }
+    return 1;
+}
+
+void dg(int now){
+    if(now==chang+1){
+        if(pan(flag)==1){
+            ans++;
+        }
+    }else{
+        for(int i=1;i<=shu;i++){
+            flag*=10;
+            flag+=i;
+            dg(now+1);
+            flag/=10;
+        }
+    }
+}
+
+int main()
+{
+    cin>>shu>>chang;
+    dg(1);
+    cout<<ans;
+}
diff --git a/1669_nweishu/main.exe b/1669_nweishu/main.exe
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Binary files /dev/null and b/1669_nweishu/main.exe differ
diff --git a/1669_nweishu/test/in.txt b/1669_nweishu/test/in.txt
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+++ b/1669_nweishu/test/in.txt
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+8 4
diff --git a/1669_nweishu/test/in2.txt b/1669_nweishu/test/in2.txt
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+++ b/1669_nweishu/test/in2.txt
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+8 5
diff --git a/1669_nweishu/test/in3.txt b/1669_nweishu/test/in3.txt
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+++ b/1669_nweishu/test/in3.txt
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+8 1
diff --git a/1669_nweishu/test/out.txt b/1669_nweishu/test/out.txt
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+++ b/1669_nweishu/test/out.txt
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+## z:\Chao\src\1669_nweishu\test\in.txt 
+2020/04/30 周四 18:38:22.64 
+464
+-----------------------------------------------
+Process exited after 150 ms with return value 0
+
+## z:\Chao\src\1669_nweishu\test\in2.txt 
+2020/04/30 周四 18:38:22.64 
+2871
+-----------------------------------------------
+Process exited after 140 ms with return value 0
+
+## z:\Chao\src\1669_nweishu\test\in3.txt 
+2020/04/30 周四 18:38:22.64 
+4
+-----------------------------------------------
+Process exited after 100 ms with return value 0
+