diff --git a/README.md b/README.md
index 6096c03..5b7b946 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,38 @@
-# Coding
-my-project
+#include<iostream>
+using namespace std;
+
+int main(){
+    int a,b,c;
+    cin>>a>>b>>c;
+    int w=a+b+c;
+    if(w>100){
+        cout<<"Eorror";
+    }
+    else if(w>=80){
+        cout<<"A";
+    }
+    else if(w>=75){
+        cout<<"B+";
+    }
+    else if(w>=70){
+        cout<<"B";
+    }
+    else if(w>=65){
+        cout<<"C+";
+    }
+    else if(w>=60){
+        cout<<"C";
+    }
+    else if(w>=55){
+        cout<<"D+";
+    }
+    else if(w>=50){
+        cout<<"D";
+    }
+    else{
+        cout<<"F";
+    }
+    return 0;
+}
+
+