diff --git a/05_day/bootpack.c b/05_day/bootpack.c
index 470ab0a..44c2974 100644
--- a/05_day/bootpack.c
+++ b/05_day/bootpack.c
@@ -1,3 +1,5 @@
+#include <stdio.h>
+
 void io_hlt(void);
 void io_cli(void);
 void io_out8(int port, int data);
@@ -38,14 +40,18 @@ struct BOOTINFO {
 void HariMain(void)
 {
 	struct BOOTINFO *binfo = (struct BOOTINFO *) 0x0ff0;
+	char s[40];
 
 	init_palette();
 	init_screen(binfo->vram, binfo->scrnx, binfo->scrny);
-	
+
 	putfonts8_asc(binfo->vram, binfo->scrnx,  8,  8, COL8_FFFFFF, "ABC 123");
 	putfonts8_asc(binfo->vram, binfo->scrnx, 31, 31, COL8_000000, "Haribote OS.");
 	putfonts8_asc(binfo->vram, binfo->scrnx, 30, 30, COL8_FFFFFF, "Haribote OS.");
 
+	sprintf(s, "scrnx = %d", binfo->scrnx);
+	putfonts8_asc(binfo->vram, binfo->scrnx, 16, 64, COL8_FFFFFF, s);
+
 	for (;;) {
 		io_hlt();
 	}