diff --git "a/\352\271\200\354\232\260\354\206\224/backjoon_17144.java" "b/\352\271\200\354\232\260\354\206\224/backjoon_17144.java"
new file mode 100644
index 00000000..aa315c74
--- /dev/null
+++ "b/\352\271\200\354\232\260\354\206\224/backjoon_17144.java"
@@ -0,0 +1,113 @@
+package done;
+
+import java.io.*;
+import java.util.*;
+
+public class backjoon_17144 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
+
+        StringTokenizer st = new StringTokenizer(br.readLine());
+        int row = Integer.parseInt(st.nextToken());
+        int col = Integer.parseInt(st.nextToken());
+        int T = Integer.parseInt(st.nextToken());
+        int[][] arr = new int[row][col];
+        int[] airclean = new int[2];
+
+        for (int i = 0; i < row; i++) { //좌표값
+            st = new StringTokenizer(br.readLine());
+            for (int j = 0; j < col; j++) {
+                arr[i][j] = Integer.parseInt(st.nextToken());
+            }
+        }
+
+        for (int i = 0; i < row; i++) { //공청기 위치
+            if (arr[i][0] == -1) {
+                airclean[0] = i;
+                airclean[1] = i + 1;
+                break;
+            }
+        }
+
+        ArrayList<int[]> al = new ArrayList<>();
+        int[][] temparr;
+        while (T != 0) {//t시간마다 변화
+            //미세먼지 확산
+            al.clear(); // 좌표 체크
+            for (int i = 0; i < row; i++) {
+                for (int j = 0; j < col; j++) {
+                    if (arr[i][j] > 0) {
+                        al.add(new int[]{i, j, arr[i][j]});
+                    }
+                }
+            }
+            //확산 시작
+            int count;
+            temparr = new int[row][col];
+            for (int i = 0; i < al.size(); i++) {
+                count = 0;
+                int y = al.get(i)[0];//i, j, value
+                int x = al.get(i)[1];
+                int val = al.get(i)[2];
+                if (y + 1 < row && !(x == 0 && y + 1 == airclean[0])) {//위
+                    count++;
+                    temparr[y + 1][x] += val / 5;
+                }
+                if (y - 1 >= 0 && !(x == 0 && y - 1 == airclean[1])) { //아래
+                    count++;
+                    temparr[y - 1][x] += val / 5;
+                }
+                if (x + 1 < col) {//오른쪽
+                    count++;
+                    temparr[y][x + 1] += val / 5;
+                }
+                if (x - 1 >= 0 && !((airclean[0] == y || airclean[1] == y) && x - 1 == 0)) {//왼쪽
+                    count++;
+                    temparr[y][x - 1] += val / 5;
+                }
+                temparr[y][x] += val - (val / 5 * count);
+            }
+            arr = temparr.clone();
+            //공청기 작동 // 위에 작동
+            for (int i = airclean[0] - 1; i >= 0; i--) {
+                arr[i + 1][0] = arr[i][0];
+            }
+            for (int i = 0; i < col - 1; i++) {
+                arr[0][i] = arr[0][i + 1];
+            }
+            for (int i = 0; i < airclean[0]; i++) {
+                arr[i][col - 1] = arr[i + 1][col - 1];
+            }
+            for (int i = col - 1; i > 0; i--) {
+                arr[airclean[0]][i] = arr[airclean[0]][i - 1];
+            }
+            //아래 작동
+            for (int i = airclean[1]; i < row - 1; i++) {
+                arr[i][0] = arr[i + 1][0];
+            }
+            for (int i = 0; i < col - 1; i++) {
+                arr[row - 1][i] = arr[row - 1][i + 1];
+            }
+            for (int i = row - 1; i > airclean[1]; i--) {
+                arr[i][col - 1] = arr[i - 1][col - 1];
+            }
+            for (int i = col - 1; i > 0; i--) {
+                arr[airclean[1]][i] = arr[airclean[1]][i - 1];
+            }
+            arr[airclean[1]][1] = arr[airclean[0]][1] = 0;
+            arr[airclean[1]][0] = arr[airclean[0]][0] = -1;
+            T--;
+        }
+
+        int count = 0;
+        for (int i = 0; i < row; i++) {
+            for (int j = 0; j < col; j++) {
+                count += arr[i][j];
+            }
+        }
+        bw.write(count + 2 + "\n");
+        bw.flush();
+        bw.close();
+    }
+}