diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e43b0f9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.DS_Store
diff --git a/README.md b/README.md
index 7f1a668..08a3063 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,32 @@
-# Problem-Solving-Study
\ No newline at end of file
+# Problem Solving Study
+
+## HOW TO? (2019-1)
+- 2주에 최소 3문제가 출제됩니다.
+- 
+
+## HOW TO SUBMIT SOLUTION
+
+#### 1. fork cra16's repository
+![forkImage](./images/1.png)
+#### 2. clone the forked repository
+```
+git clone https://github.com/**your username**/Problem-Solving-Study
+```
+#### 3. add a remote of cra16's repository as name 'upstream'
+```
+git remote add upstream https://github.com/cra16/Problem-Solving-Study
+```
+#### 4. fetch the remote 
+```
+git fetch upstream
+```
+#### 5. merge the upstream's master branch on your origin's master
+```
+(optional) git checkout master
+git merge master upstream/master
+```
+#### 6. make PR(Pull Request) in github
+![PRImage](./images/6.png)
+
+## HOW TO REVIEW OTHER SOLUTION
+- comment on PR
diff --git a/example/example.py b/example/example.py
deleted file mode 100644
index 6c77108..0000000
--- a/example/example.py
+++ /dev/null
@@ -1,8 +0,0 @@
-# CRA Problem Solving Study
-
-for i in range(1000000000):
-	print("Problem Solving은 반드시 꾸준히 해야합니다!", sep="")
-	print("그래서 의무로 했으면 좋겠습니다.")
-	print("이번 학기, 시범적으로 운영하고 학기 말에 회칙에 발의하겠습니다.")
-	break
-
diff --git a/images/1.png b/images/1.png
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Binary files /dev/null and b/images/1.png differ
diff --git a/images/6.png b/images/6.png
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diff --git a/problems/example/21400564.py b/problems/example/21400564.py
new file mode 100644
index 0000000..b647661
--- /dev/null
+++ b/problems/example/21400564.py
@@ -0,0 +1 @@
+print('우주최강 전산동아리 CRA')
diff --git a/problems/example/README.md b/problems/example/README.md
new file mode 100644
index 0000000..f0dea1e
--- /dev/null
+++ b/problems/example/README.md
@@ -0,0 +1,23 @@
+# Problem
+
+한동대학교 전산동아리 CRA(Computer Research Association)의 수식어는 우주정복과 우주최강이 있으며, 
+현재 '우주최강 전산동아리 CRA'라고 자칭(?)하고 있습니다.
+**콘솔에 "우주최강 전산동아리 CRA"를 출력하세요.**
+
+# 제한사항
+
+없음
+
+# 입력 설명 및 예제
+```
+입력값 없음
+```
+# 출력 설명 및 예제
+```
+우주최강 전산동아리 CRA
+```
+
+# 언어제한
+- C/C++
+- Java 
+- Python3