diff --git a/Topic-12/server.c b/Topic-12/server.c
index 82b79ee..ec946e3 100644
--- a/Topic-12/server.c
+++ b/Topic-12/server.c
@@ -1,5 +1,60 @@
+#include <arpa/inet.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+void handle_arguments(int argc, char *argv[]) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s PORT\n", argv[0]);
+        exit(EXIT_FAILURE);
+    }
+}
+
 void run_server(int port) {
-	
+	int sockfd = socket(AF_INET, SOCK_STREAM, 0);
+	if (sockfd < 0) {
+		fprintf(stderr, "socket: ");
+		exit(EXIT_FAILURE);
+	}
+
+	struct sockaddr_in serv_addr, client_addr;
+	socklen_t client_addr_len;
+	memset(&serv_addr, 0, sizeof(serv_addr));
+	memset(&client_addr, 0, sizeof(client_addr));
+	serv_addr.sin_family = AF_INET;
+	serv_addr.sin_port = htons(port);
+	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+	int rv = bind(sockfd, (const struct sockaddr *)&serv_addr, sizeof(serv_addr));
+	if (rv < 0) {
+		fprintf(stderr, "bind: ");
+		exit(EXIT_FAILURE);
+	}
+
+	rv = listen(sockfd, 5);
+	if (rv < 0) {
+		fprintf(stderr, "listen: ");
+		exit(EXIT_FAILURE);
+	}
+
+	int accfd = accept(sockfd, (struct sockaddr *)&client_addr, &client_addr_len);
+	if (accfd < 0) {
+		fprintf(stderr, "accept: ");
+		exit(EXIT_FAILURE);
+	}
+
+
+	size_t buffer_size = 100;
+	char buffer[buffer_size];
+	memset(&buffer, 0, buffer_size);
+
+	while (1) {
+		read(accfd, buffer, buffer_size);
+		write(accfd, buffer, buffer_size);
+		memset(&buffer, 0, buffer_size);
+	}
 }
 
 int main(int argc, char *argv[]) {
@@ -9,8 +64,8 @@ int main(int argc, char *argv[]) {
 	// listen()
 	// accept
 	// send/recv
-
-	run_server(2137);
+	handle_arguments(argc, argv);
+	run_server(strtol(argv[1], NULL, 10));
 
 	return 0;
 }
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