diff --git a/.vscode/settings.json b/.vscode/settings.json
index 01faa21..e9f6b6e 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -24,7 +24,8 @@
         "vector": "cpp",
         "unordered_map": "cpp",
         "unordered_set": "cpp",
-        "string_view": "cpp"
+        "string_view": "cpp",
+        "cmath": "cpp"
     },
     "terminal.integrated.automationShell.windows": "cmd.exe",
     "files.encoding": "gb18030",
diff --git a/1598_roundfind_sushu/Readme.md b/1598_roundfind_sushu/Readme.md
new file mode 100644
index 0000000..b4f8d75
--- /dev/null
+++ b/1598_roundfind_sushu/Readme.md
@@ -0,0 +1,3 @@
+# 标题
+
+* 内容
\ No newline at end of file
diff --git a/1598_roundfind_sushu/doc/Readme.md b/1598_roundfind_sushu/doc/Readme.md
new file mode 100644
index 0000000..4e768b5
--- /dev/null
+++ b/1598_roundfind_sushu/doc/Readme.md
@@ -0,0 +1 @@
+# 
\ No newline at end of file
diff --git a/1598_roundfind_sushu/doc/鍦嗙幆涓婃眰绱犳暟III.pdf b/1598_roundfind_sushu/doc/鍦嗙幆涓婃眰绱犳暟III.pdf
new file mode 100644
index 0000000..4c9ca48
Binary files /dev/null and b/1598_roundfind_sushu/doc/鍦嗙幆涓婃眰绱犳暟III.pdf differ
diff --git a/1598_roundfind_sushu/main.cpp b/1598_roundfind_sushu/main.cpp
new file mode 100644
index 0000000..88ea141
--- /dev/null
+++ b/1598_roundfind_sushu/main.cpp
@@ -0,0 +1,81 @@
+#include <cmath>
+#include <iostream>
+using namespace std;
+int n, k,a[8] = { 0, 1, 2, 3, 4, 5, 6, 7 },allans=0;
+bool ce[8]={0};
+bool pan(int n)
+{
+    int len = sqrt(n);
+    for (int i = 2; i <= len; i++) {
+        if (n % i == 0) {
+            return 0;
+        }
+    }
+    return 1;
+}
+void dg(int xian){
+    if(xian>n){
+        // for(int i=1;i<=n;i++){
+        //     cout<<a[i]<<" ";
+        // }
+        // cout<<endl;
+
+        int now = 0, zong = 1, ans = 0;
+        for (int i = n - k + 2; i <= n; i++) {
+            now *= 10;
+            now += a[i];
+            zong *= 10;
+        }
+        for (int i = 1; i <= n; i++) {
+            now %= zong;
+            now *= 10;
+            now += a[i];
+            ans += pan(now);
+        }
+        if(ans>allans){
+            allans=ans;
+        }
+    }
+    for(int i=2;i<=n;i++){
+        if(ce[i]==0){
+            a[xian]=i;
+            ce[i]=1;
+            dg(xian+1);
+            ce[i]=0;
+        }
+    }
+}
+int main()
+{
+    int now = 0, zong = 1, ans = 0;
+    cin >> n >> k;
+    if (k == 1) {
+        if (n == 1) {
+            cout << "0" << endl
+                 << "0";
+        } else {
+            int chu = 1;
+            for (int i = 3; i <= n; i+=2) {
+                chu++;
+            }
+            cout << chu << endl
+                 << chu;
+        }
+    } else {
+        for (int i = n - k + 2; i <= n; i++) {
+            now *= 10;
+            now += a[i];
+            zong *= 10;
+        }
+        for (int i = 1; i <= n; i++) {
+            now %= zong;
+            now *= 10;
+            now += a[i];
+            ans += pan(now);
+        }
+        cout<<ans<<endl;
+        dg(2);
+        cout<<allans;
+    }
+    return 0;
+}
diff --git a/1598_roundfind_sushu/main.exe b/1598_roundfind_sushu/main.exe
new file mode 100644
index 0000000..fd66bd5
Binary files /dev/null and b/1598_roundfind_sushu/main.exe differ
diff --git a/1598_roundfind_sushu/test/in.txt b/1598_roundfind_sushu/test/in.txt
new file mode 100644
index 0000000..c1d5661
--- /dev/null
+++ b/1598_roundfind_sushu/test/in.txt
@@ -0,0 +1 @@
+7 1
\ No newline at end of file
diff --git a/1598_roundfind_sushu/test/in2.txt b/1598_roundfind_sushu/test/in2.txt
new file mode 100644
index 0000000..fdd0e0c
--- /dev/null
+++ b/1598_roundfind_sushu/test/in2.txt
@@ -0,0 +1 @@
+7 3
diff --git a/1598_roundfind_sushu/test/in3.txt b/1598_roundfind_sushu/test/in3.txt
new file mode 100644
index 0000000..e9d4c61
--- /dev/null
+++ b/1598_roundfind_sushu/test/in3.txt
@@ -0,0 +1 @@
+6 4
\ No newline at end of file
diff --git a/1598_roundfind_sushu/test/out.txt b/1598_roundfind_sushu/test/out.txt
new file mode 100644
index 0000000..75b4c92
--- /dev/null
+++ b/1598_roundfind_sushu/test/out.txt
@@ -0,0 +1,21 @@
+## z:\Chao\src\1598_roundfind_sushu\test\in.txt 
+2020/06/13 周六  9:56:47.43 
+4
+4
+-----------------------------------------------
+Process exited after 180 ms with return value 0
+
+## z:\Chao\src\1598_roundfind_sushu\test\in2.txt 
+2020/06/13 周六  9:56:47.43 
+0
+3
+-----------------------------------------------
+Process exited after 100 ms with return value 0
+
+## z:\Chao\src\1598_roundfind_sushu\test\in3.txt 
+2020/06/13 周六  9:56:47.43 
+1
+2
+-----------------------------------------------
+Process exited after 90 ms with return value 0
+