diff --git a/.gitignore b/.gitignore
index 524ab92..a578246 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,13 @@
 .DS_Store
 ._.DS_Store
 **/.DS_Store
-**/._.DS_Store
\ No newline at end of file
+**/._.DS_Store
+
+# IntelliJ project files
+.idea
+.idea/*.xml
+*.iml
+out
+gen
+build
+rebel.xml
\ No newline at end of file
diff --git "a/Beakjoon/atsunset529/week_3/\352\267\270\353\243\271\353\213\250\354\226\264\354\262\264\354\273\244.py" "b/Beakjoon/atsunset529/week_3/\352\267\270\353\243\271\353\213\250\354\226\264\354\262\264\354\273\244.py"
new file mode 100644
index 0000000..e69a48f
--- /dev/null
+++ "b/Beakjoon/atsunset529/week_3/\352\267\270\353\243\271\353\213\250\354\226\264\354\262\264\354\273\244.py"
@@ -0,0 +1,19 @@
+
+### [Baekjoon-1316] 그룹단어체커
+
+cnt = 0
+n = int(input())
+#words = list(map(str, input().lower().split()))
+
+for i in range(n):
+  if n < 101:
+    word = input()
+    if list(word) == sorted(word, key=word.find): #only sorted: cbac->abcc, with .find->ccba
+      cnt += 1
+  else:
+    print("n < 101")
+    break
+
+print(cnt)
+
+#https://www.acmicpc.net/problem/1316
\ No newline at end of file
diff --git "a/Beakjoon/atsunset529/week_3/\354\205\200\355\224\204_\353\204\230\353\262\204.py" "b/Beakjoon/atsunset529/week_3/\354\205\200\355\224\204_\353\204\230\353\262\204.py"
new file mode 100644
index 0000000..6f10077
--- /dev/null
+++ "b/Beakjoon/atsunset529/week_3/\354\205\200\355\224\204_\353\204\230\353\262\204.py"
@@ -0,0 +1,17 @@
+
+### [Baekjoon-4673] 셀프넘버
+
+
+numbers = set(range(1, 10001))
+non_selfnumbers = set()
+
+#n을 d(n)의 생성자라 하고 셀프넘버는 생성자가 없는 숫자
+#이때 dn은 수열; 33 + 3 + 3 = 39이고, 그 다음 수는 39 + 3 + 9 = 51
+for d_n in numbers:
+  for n in str(d_n):
+    d_n += int(n)
+  non_selfnumbers.add(d_n) #셀프넘버가 아닌 숫자를 집합에 추가
+
+selfnum = numbers - non_selfnumbers #둘 다 집합이라 차집합 계산
+print(sorted(selfnum)) #정렬
+#https://www.acmicpc.net/problem/4673
\ No newline at end of file
diff --git "a/Beakjoon/atsunset529/week_3/\354\206\214\354\210\230\354\260\276\352\270\260.py" "b/Beakjoon/atsunset529/week_3/\354\206\214\354\210\230\354\260\276\352\270\260.py"
new file mode 100644
index 0000000..b36f0a8
--- /dev/null
+++ "b/Beakjoon/atsunset529/week_3/\354\206\214\354\210\230\354\260\276\352\270\260.py"
@@ -0,0 +1,25 @@
+
+### [Baekjoon-1978] 소수찾기
+
+n = int(input())
+data = list(map(int, input().split()))
+prime_num = 0
+
+if n == len(data): #첫줄 수의 갯수 n
+
+  for i in data: #n개중 소수의 개수 구하기
+      cnt = 0 
+      if(i == 1): 
+          continue
+      for j in range(2, i+1):
+          if(i % j == 0): #2~자신의 수까지 나누어떨어지는지
+              cnt += 1 
+      if(cnt == 1): #자신으로 나눈 하나만 나머지가 없었다면 소수
+          prime_num += 1
+
+  print(prime_num)  
+
+else:
+  print("첫번째 입력한 숫자를 확인하세요")
+
+#https://www.acmicpc.net/problem/1978
\ No newline at end of file
diff --git "a/Programmers/atsunset529/week_1/\352\270\260\353\212\245\352\260\234\353\260\234.py" "b/Programmers/atsunset529/week_1/\352\270\260\353\212\245\352\260\234\353\260\234.py"
new file mode 100644
index 0000000..e69de29
diff --git "a/Programmers/atsunset529/week_1/\354\231\204\354\243\274\355\225\230\354\247\200\353\252\273\355\225\234\354\204\240\354\210\230.py" "b/Programmers/atsunset529/week_1/\354\231\204\354\243\274\355\225\230\354\247\200\353\252\273\355\225\234\354\204\240\354\210\230.py"
new file mode 100644
index 0000000..0d57d9f
--- /dev/null
+++ "b/Programmers/atsunset529/week_1/\354\231\204\354\243\274\355\225\230\354\247\200\353\252\273\355\225\234\354\204\240\354\210\230.py"
@@ -0,0 +1,16 @@
+#[Programmers] 완주하지못한선수
+
+def solution(participant, completion):
+    participant = sorted(participant) #['filipa', 'josipa', 'marina', 'nikola', 'vinko']
+    completion = sorted(completion) #['filipa', 'josipa', 'marina', 'nikola']
+
+    for i in range(len(completion)):
+        if participant[i] != completion[i]: #예시는 지금 이경우 없음
+            answer = participant[i]
+            return answer
+
+    answer = participant[-1] #없으면 리스트 마지막인 vinko출력
+    return answer
+
+#https://school.programmers.co.kr/learn/courses/30/lessons/42576?language=python3#
+
diff --git "a/Programmers/atsunset529/week_1/\354\240\204\355\231\224\353\262\210\355\230\270\353\252\251\353\241\235.py" "b/Programmers/atsunset529/week_1/\354\240\204\355\231\224\353\262\210\355\230\270\353\252\251\353\241\235.py"
new file mode 100644
index 0000000..e78a610
--- /dev/null
+++ "b/Programmers/atsunset529/week_1/\354\240\204\355\231\224\353\262\210\355\230\270\353\252\251\353\241\235.py"
@@ -0,0 +1,13 @@
+#[Programmers] 전화번호목록
+
+def solution(phone_book):
+  phone_book = sorted(phone_book) #문자로 정렬
+
+  for i in range(len(phone_book)):
+    for j in range(len(phone_book)):
+      if i != j and phone_book[i].startswith(phone_book[j]): #i가 j로 시작하면 false출력
+        return False
+
+  return True
+
+#https://school.programmers.co.kr/learn/courses/30/lessons/42577?language=python3
\ No newline at end of file
diff --git a/Programmers/atsunset529/week_2/test.py b/Programmers/atsunset529/week_2/test.py
new file mode 100644
index 0000000..bef572d
--- /dev/null
+++ b/Programmers/atsunset529/week_2/test.py
@@ -0,0 +1 @@
+print("????")