diff --git a/1656_brotherthink/Readme.md b/1656_brotherthink/Readme.md
new file mode 100644
index 0000000..d34a2d9
--- /dev/null
+++ b/1656_brotherthink/Readme.md
@@ -0,0 +1,23 @@
+# 哥德巴赫猜想的所有解
+
+[问题描述]
+
+教学案例，必须使用函数完成求解！
+
+　　求出哥德巴赫猜想的所有解（将一个大于9的奇数拆分成三个素数之和），并按从小到的顺序写出。
+
+[输入格式]  
+　　一行，一个大于9的奇数。
+
+[输出格式]  
+　　第1行，一个整数N，表示解的总数。 
+　　第2至N+1行，每行一个解。
+
+[输入样例]  
+15
+
+[输出样例]  
+3  
+15=2+2+11  
+15=3+5+7  
+15=5+5+5  
diff --git a/1656_brotherthink/brotherthink.cpp b/1656_brotherthink/brotherthink.cpp
new file mode 100644
index 0000000..ee5fc07
--- /dev/null
+++ b/1656_brotherthink/brotherthink.cpp
@@ -0,0 +1,36 @@
+#include<iostream>
+using namespace std;
+int zh[10000001]={1},a[10000001][4];
+bool zhi(int n){
+    for(int i=2;i*i<=n;i++){
+        if(n%i==0){
+            return 0;
+        }
+    }
+    return 1;
+}
+int main(){
+    int n,ans=0;
+    cin>>n;
+    zh[1]=2;
+    for(int i=3;i<=n-4;i++){
+        if(zhi(i)==1){
+            zh[++zh[0]]=i;
+        }
+    }   
+    for(int i=1;zh[i]*3<=n;i++){
+        for(int j=i;zh[j]<=n-zh[i]-zh[j];j++){
+            int now=n-zh[i]-zh[j];
+            if(zhi(now)==1){
+                ans++;
+                a[ans][1]=zh[i];
+                a[ans][2]=zh[j];
+                a[ans][3]=now;
+            }
+        }
+    } 
+    cout<<ans;
+    for(int i=1;i<=ans;i++){
+        cout<<endl<<n<<"="<<a[i][1]<<"+"<<a[i][2]<<"+"<<a[i][3];
+    }
+}
\ No newline at end of file
diff --git a/1656_brotherthink/brotherthink.exe b/1656_brotherthink/brotherthink.exe
new file mode 100644
index 0000000..fd287e9
Binary files /dev/null and b/1656_brotherthink/brotherthink.exe differ
diff --git a/1656_brotherthink/doc/Readme.md b/1656_brotherthink/doc/Readme.md
new file mode 100644
index 0000000..b4f8d75
--- /dev/null
+++ b/1656_brotherthink/doc/Readme.md
@@ -0,0 +1,3 @@
+# 标题
+
+* 内容
\ No newline at end of file
diff --git a/1656_brotherthink/main.cpp b/1656_brotherthink/main.cpp
new file mode 100644
index 0000000..f39ad54
--- /dev/null
+++ b/1656_brotherthink/main.cpp
@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "Hello Easy C++ project!" << std::endl;
+}
diff --git a/1656_brotherthink/main.exe b/1656_brotherthink/main.exe
new file mode 100644
index 0000000..fc4df42
Binary files /dev/null and b/1656_brotherthink/main.exe differ
diff --git a/1656_brotherthink/test/in.txt b/1656_brotherthink/test/in.txt
new file mode 100644
index 0000000..3f10ffe
--- /dev/null
+++ b/1656_brotherthink/test/in.txt
@@ -0,0 +1 @@
+15
\ No newline at end of file
diff --git a/1656_brotherthink/test/in2.txt b/1656_brotherthink/test/in2.txt
new file mode 100644
index 0000000..d97edbb
--- /dev/null
+++ b/1656_brotherthink/test/in2.txt
@@ -0,0 +1 @@
+99
\ No newline at end of file
diff --git a/1656_brotherthink/test/out.txt b/1656_brotherthink/test/out.txt
new file mode 100644
index 0000000..6565f22
--- /dev/null
+++ b/1656_brotherthink/test/out.txt
@@ -0,0 +1,45 @@
+## z:\Chao\src\1656_brotherthink\test\in.txt 
+2020/04/05 周日 22:37:20.09 
+3
+15=2+2+11
+15=3+5+7
+15=5+5+5
+-----------------------------------------------
+Process exited after 210 ms with return value 0
+
+## z:\Chao\src\1656_brotherthink\test\in2.txt 
+2020/04/05 周日 22:37:20.09 
+30
+99=3+7+89
+99=3+13+83
+99=3+17+79
+99=3+23+73
+99=3+29+67
+99=3+37+59
+99=3+43+53
+99=5+5+89
+99=5+11+83
+99=5+23+71
+99=5+41+53
+99=5+47+47
+99=7+13+79
+99=7+19+73
+99=7+31+61
+99=11+17+71
+99=11+29+59
+99=11+41+47
+99=13+13+73
+99=13+19+67
+99=13+43+43
+99=17+23+59
+99=17+29+53
+99=17+41+41
+99=19+19+61
+99=19+37+43
+99=23+23+53
+99=23+29+47
+99=29+29+41
+99=31+31+37
+-----------------------------------------------
+Process exited after 90 ms with return value 0
+