From 79ba74e73dfb19f5d8494a2f78ae3431f4bed4ba Mon Sep 17 00:00:00 2001
From: suyeun84 <81475092+suyeun84@users.noreply.github.com>
Date: Sun, 3 Aug 2025 14:11:51 +0900
Subject: [PATCH] =?UTF-8?q?[20250803]=20BOJ=20/=20G5=20/=204=EC=99=80=207?=
 =?UTF-8?q?=20/=20=EA=B9=80=EC=88=98=EC=97=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../202508/03 BOJ G5 4\354\231\200 7.md"      | 30 +++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 "suyeun84/202508/03 BOJ G5 4\354\231\200 7.md"

diff --git "a/suyeun84/202508/03 BOJ G5 4\354\231\200 7.md" "b/suyeun84/202508/03 BOJ G5 4\354\231\200 7.md"
new file mode 100644
index 00000000..927877c6
--- /dev/null
+++ "b/suyeun84/202508/03 BOJ G5 4\354\231\200 7.md"	
@@ -0,0 +1,30 @@
+```java
+import java.io.*;
+import java.util.*;
+
+public class boj2877 {
+	static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+	static StringTokenizer st;
+	static void nextLine() throws Exception {st = new StringTokenizer(br.readLine());}
+	static int nextInt() {return Integer.parseInt(st.nextToken());}
+	static StringBuilder sb = new StringBuilder();
+
+	public static void main(String[] args) throws Exception {
+		nextLine();
+		int K = nextInt() + 1;
+		
+		int num = 0;
+        while(K != 0){
+            num = K % 2;
+            sb.append(num);
+            K = K / 2;
+        }
+        StringBuilder result = new StringBuilder();
+        for(int i = sb.toString().length() - 2; i >= 0; i--){
+            if(sb.charAt(i) == '0') result.append(4);
+            else result.append(7);
+        }
+        System.out.println(result.toString());
+	}
+}
+```