diff --git a/_hyunseo/3425.py b/_hyunseo/3425.py
new file mode 100644
index 00000000..573bc631
--- /dev/null
+++ b/_hyunseo/3425.py
@@ -0,0 +1,104 @@
+import sys
+
+input = sys.stdin.read
+
+def run_stack_machine(commands, start_num):
+    stack = [start_num]
+    LIMIT = 10**9
+
+    for cmd in commands:
+        try:
+            if cmd.startswith("NUM"):
+                val = int(cmd.split()[1])
+                stack.append(val)
+            
+            elif cmd == "POP":
+                if not stack: return "ERROR"
+                stack.pop()
+                
+            elif cmd == "INV":
+                if not stack: return "ERROR"
+                stack[-1] = -stack[-1]
+                
+            elif cmd == "DUP":
+                if not stack: return "ERROR"
+                stack.append(stack[-1])
+                
+            elif cmd == "SWP":
+                if len(stack) < 2: return "ERROR"
+                stack[-1], stack[-2] = stack[-2], stack[-1]
+
+            elif cmd == "ADD":
+                if len(stack) < 2: return "ERROR"
+                a, b = stack.pop(), stack.pop()
+                res = b + a
+                if abs(res) > LIMIT: return "ERROR"
+                stack.append(res)
+
+            elif cmd == "SUB":
+                if len(stack) < 2: return "ERROR"
+                a, b = stack.pop(), stack.pop()
+                res = b - a
+                if abs(res) > LIMIT: return "ERROR"
+                stack.append(res)
+
+            elif cmd == "MUL":
+                if len(stack) < 2: return "ERROR"
+                a, b = stack.pop(), stack.pop()
+                res = b * a
+                if abs(res) > LIMIT: return "ERROR"
+                stack.append(res)
+
+            elif cmd == "DIV":
+                if len(stack) < 2: return "ERROR"
+                a, b = stack.pop(), stack.pop()
+                if a == 0: return "ERROR"
+                
+                res = abs(b) // abs(a)
+                if (a < 0 and b > 0) or (a > 0 and b < 0):
+                    res = -res
+                stack.append(res)
+
+            elif cmd == "MOD":
+                if len(stack) < 2: return "ERROR"
+                a, b = stack.pop(), stack.pop()
+                if a == 0: return "ERROR"
+                res = abs(b) % abs(a)
+                if b < 0:
+                    res = -res
+                stack.append(res)
+        except:
+            return "ERROR"
+
+    if len(stack) == 1:
+        return stack[0]
+    else:
+        return "ERROR"
+
+# --- 메인 실행부 ---
+data = input().split()
+idx = 0
+
+while idx < len(data):
+    if data[idx] == "QUIT":
+        break
+    
+    # 명령어 모으기
+    commands = []
+    while data[idx] != "END":
+        if data[idx] == "NUM":
+            commands.append(f"NUM {data[idx+1]}")
+            idx += 2
+        else:
+            commands.append(data[idx])
+            idx += 1
+    idx += 1
+    
+    n = int(data[idx])
+    idx += 1
+    for _ in range(n):
+        start_val = int(data[idx])
+        idx += 1
+        print(run_stack_machine(commands, start_val))
+    
+    print() # 기계별 구분 빈 줄