diff --git a/parts/1/exerciseApp/src/App.jsx b/parts/1/exerciseApp/src/App.jsx
index 566d84b..33c3557 100644
--- a/parts/1/exerciseApp/src/App.jsx
+++ b/parts/1/exerciseApp/src/App.jsx
@@ -20,42 +20,42 @@ const Content = (props) => {
 const Total = (props) => {
   return (
     <>
-    <p>Number of exercises {props.totalExerciseCount}</p>
+    <p>Number of exercises {props.sections.reduce(
+      (sum, section) => {
+        return sum + section.exerciseCount
+      },
+      0
+    )}</p>
     </>
   )
 }
 
 
 const App = () => {
-  const course = 'Half Stack application development'
-  const part1 = 'Fundamentals of React'
-  const exercises1 = 10
-  const part2 = 'Using props to pass data'
-  const exercises2 = 7
-  const part3 = 'State of a component'
-  const exercises3 = 14
-
-  const sections = [
-    {
-      part: part1,
-      exerciseCount: exercises1
-    },
-    {
-      part: part2,
-      exerciseCount: exercises2
-    },
-    {
-      part: part3,
-      exerciseCount: exercises3
-    },
-    
-  ]
+  const course = {
+    name: 'Half Stack application development',
+    sections: [
+      {
+        part: 'Fundamentals of React',
+        exerciseCount: 10
+      },
+      {
+        part: 'Using props to pass data',
+        exerciseCount: 7
+      },
+      {
+        part: 'State of a component',
+        exerciseCount: 14
+      },
+      
+    ]
+  }
 
   return (
     <div>
-      <Header course={course}/>
-      <Content sections={sections}/>
-      <Total totalExerciseCount={exercises1 + exercises2 + exercises3}/>
+      <Header course={course.name}/>
+      <Content sections={course.sections}/>
+      <Total sections={course.sections}/>
     </div>
   )
 }
diff --git a/parts/1/notes.md b/parts/1/notes.md
index b42ea3d..c6d3c15 100644
--- a/parts/1/notes.md
+++ b/parts/1/notes.md
@@ -2,9 +2,9 @@ How to start a react app:
 `npm create vite@latest <your apps name here> -- --template react`
 
 Exercises:
-* [ ] 1.1
-* [ ] 1.2
-* [ ] 1.3
-* [ ] 1.4
-* [ ] 1.5
+* [X] 1.1
+* [X] 1.2
+* [X] 1.3
+* [X] 1.4
+* [X] 1.5