diff --git "a/BOJ/Java/src/S4/Boj_4821_\355\216\230\354\235\264\354\247\200\354\204\270\352\270\260.java" "b/BOJ/Java/src/S4/Boj_4821_\355\216\230\354\235\264\354\247\200\354\204\270\352\270\260.java"
new file mode 100644
index 00000000..2af7e5a3
--- /dev/null
+++ "b/BOJ/Java/src/S4/Boj_4821_\355\216\230\354\235\264\354\247\200\354\204\270\352\270\260.java"
@@ -0,0 +1,49 @@
+package S4;
+
+import java.io.*;
+import java.util.StringTokenizer;
+
+public class Boj_4821_페이지세기 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+        StringBuilder sb = new StringBuilder();
+
+        int max;
+
+        while ((max = Integer.parseInt(br.readLine())) != 0) {
+            StringTokenizer st = new StringTokenizer(br.readLine(), ",");
+            boolean[] used = new boolean[max + 1];
+
+            while (st.hasMoreTokens()) {
+                String s = st.nextToken();
+
+                if (s.contains("-")) {
+                    StringTokenizer st2 = new StringTokenizer(s, "-");
+                    int start = Integer.parseInt(st2.nextToken());
+                    int end = Integer.parseInt(st2.nextToken());
+
+                    for (int i = start; i <= end && i <= max; i++) {
+                        used[i] = true;
+                    }
+                } else {
+                    int page = Integer.parseInt(s);
+                    if (0 < page && page <= max) {
+                        used[Integer.parseInt(s)] = true;
+                    }
+                }
+            }
+
+            int cnt = 0;
+
+            for (boolean use : used) {
+                if (use) cnt++;
+            }
+
+            sb.append(cnt).append('\n');
+        }
+
+        bw.write(sb.toString());
+        bw.flush();
+    }
+}