diff --git "a/_youngman/\353\217\204\354\204\234\352\264\200.java" "b/_youngman/\353\217\204\354\204\234\352\264\200.java"
new file mode 100644
index 00000000..e9021790
--- /dev/null
+++ "b/_youngman/\353\217\204\354\204\234\352\264\200.java"
@@ -0,0 +1,26 @@
+import java.io.*;
+import java.util.*;
+
+public class Main {
+    public static void main(String[] args) throws Exception {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        StringTokenizer st = new StringTokenizer(br.readLine().trim());
+        double A = Double.parseDouble(st.nextToken());
+        double B = Double.parseDouble(st.nextToken());
+        double C = Double.parseDouble(st.nextToken());
+
+        // 탐색 구간
+        double lo = Math.max(0.0, (C - B) / A);
+        double hi = (C + B) / A;
+
+        // 이분탐색
+        for (int it = 0; it < 200; it++) { // 200번이면 2^-200 수준으로 충분히 정확
+            double mid = (lo + hi) / 2.0;
+            double f = A * mid + B * Math.sin(mid) - C;
+            if (f < 0) lo = mid;
+            else hi = mid;
+        }
+
+        System.out.println(String.format(Locale.US, "%.15f", (lo + hi) / 2.0));
+    }
+}