diff --git a/04_Multifile/prog.c b/04_Multifile/prog.c
new file mode 100644
index 0000000..f448dbe
--- /dev/null
+++ b/04_Multifile/prog.c
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include "outlib.h"
+int main(int argc, char* argv[]) {
+    int i;
+    if ((Count = argc) > 1) {
+        output("<INIT>");
+        for (i = 1; i < argc; i++)
+            output(argv[i]);
+        output("<DONE>");
+    } else
+        usage(argv[0]);
+    return 0;
+}