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import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class CustomSynchronizedMap<K, V> {
    private ConcurrentHashMap<K, V> map = new ConcurrentHashMap<>();
    private Lock lock = new ReentrantLock();

    public void put(K key, V value) {
        lock.lock();
        try {
            map.put(key, value);
        } finally {
            lock.unlock();
        }
    }

    public V get(K key) {
        lock.lock();
        try {
            return map.get(key);
        } finally {
            lock.unlock();
        }
    }

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}

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