diff --git a/sohyeon/src/week24/boj16928.java b/sohyeon/src/week24/boj16928.java
new file mode 100644
index 0000000..a4fbbc2
--- /dev/null
+++ b/sohyeon/src/week24/boj16928.java
@@ -0,0 +1,67 @@
+package week24;
+
+import java.io.*;
+import java.util.*;
+
+public class boj16928 {
+
+	static int N, M;
+	static int[] visited = new int[101];
+	static int[] board = new int[101];
+
+	public static void main(String[] args) throws Exception {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+		StringTokenizer st = new StringTokenizer(br.readLine());
+		N = Integer.parseInt(st.nextToken());
+		M = Integer.parseInt(st.nextToken());
+
+		for (int i = 1; i <= 100; i++) {
+			board[i] = i;
+		}
+
+		for (int i = 0; i < N; i++) {
+			st = new StringTokenizer(br.readLine());
+			int x = Integer.parseInt(st.nextToken());
+			int y = Integer.parseInt(st.nextToken());
+			board[x] = y;
+		}
+
+		for (int i = 0; i < M; i++) {
+			st = new StringTokenizer(br.readLine());
+			int u = Integer.parseInt(st.nextToken());
+			int v = Integer.parseInt(st.nextToken());
+			board[u] = v;
+		}
+
+		System.out.println(bfs());
+
+	}
+
+	private static int bfs() {
+		Queue<Integer> queue = new LinkedList<>();
+		queue.add(1);
+
+		while (!queue.isEmpty()) {
+			int now = queue.poll();
+
+			if (board[now] == 100) {
+				return visited[100];
+			}
+
+			for (int i = 1; i <= 6; i++) {
+				int next = now + i;
+				if (next > 100)
+					continue;
+				next = board[next];
+				if (visited[next] == 0) {
+					visited[next] = visited[now] + 1;
+					queue.add(next);
+				}
+			}
+		}
+
+		return -1;
+
+	}
+}
diff --git a/sohyeon/src/week24/boj17219.java b/sohyeon/src/week24/boj17219.java
new file mode 100644
index 0000000..3ced5c2
--- /dev/null
+++ b/sohyeon/src/week24/boj17219.java
@@ -0,0 +1,35 @@
+package week24;
+
+import java.io.*;
+import java.util.*;
+
+public class boj17219 {
+
+	static int N, M;
+
+	public static void main(String[] args) throws Exception {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+		StringTokenizer st = new StringTokenizer(br.readLine());
+		N = Integer.parseInt(st.nextToken());
+		M = Integer.parseInt(st.nextToken());
+
+		HashMap<String, String> map = new HashMap<>();
+
+		for (int i = 0; i < N; i++) {
+			st = new StringTokenizer(br.readLine());
+			String site = st.nextToken();
+			String password = st.nextToken();
+			map.put(site, password);
+		}
+
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < M; i++) {
+			String site = br.readLine();
+			sb.append(map.get(site)).append("\n");
+		}
+
+		System.out.println(sb);
+
+	}
+}
\ No newline at end of file
diff --git a/sohyeon/src/week24/boj17626.java b/sohyeon/src/week24/boj17626.java
new file mode 100644
index 0000000..150af17
--- /dev/null
+++ b/sohyeon/src/week24/boj17626.java
@@ -0,0 +1,28 @@
+package week24;
+
+import java.io.*;
+import java.util.*;
+
+public class boj17626 {
+
+	public static void main(String[] args) throws Exception {
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		int num = Integer.parseInt(br.readLine());
+
+		int[] dp = new int[num + 1];
+		dp[1] = 1;
+
+		int min;
+		for (int i = 2; i <= num; i++) {
+			min = Integer.MAX_VALUE;
+			for (int j = 1; j * j <= i; j++) {
+				int temp = i - j * j;
+				min = Math.min(min, dp[temp]);
+			}
+			dp[i] = min + 1;
+		}
+
+		System.out.println(dp[num]);
+
+	}
+}
\ No newline at end of file