diff --git a/Part3/09_memory/kernel/kernel.c b/Part3/09_memory/kernel/kernel.c
index e78ea74..2c0a99e 100644
--- a/Part3/09_memory/kernel/kernel.c
+++ b/Part3/09_memory/kernel/kernel.c
@@ -39,8 +39,8 @@
             if (sstrlen(input, 15) > 4) {
                 char *number = input + 4;
                 u32 result = digit_conver(number);
-                int nDigits = floor(log10(abs(result))) + 1;
-                if (sstrlen(*number, 15) > nDigits + 4) {
+                int nDigits = digit_len(result);
+                if (sstrlen(number, 15) > nDigits + 4) {
                     kprint("There is a limit");
                 }
                 if (result < 10000) {
@@ -116,6 +116,20 @@
     }
 
 
+    int digit_len(unsigned digit) {
+        if (x >= 1000000000) return 10;
+        if (x >= 100000000)  return 9;
+        if (x >= 10000000)   return 8;
+        if (x >= 1000000)    return 7;
+        if (x >= 100000)     return 6;
+        if (x >= 10000)      return 5;
+        if (x >= 1000)       return 4;
+        if (x >= 100)        return 3;
+        if (x >= 10)         return 2;
+        return 1;
+    }
+
+
     int digit_conver(const char *hexString) {
         u32 result = 0;
         while (*hexString != '\0') {
diff --git a/Part3/09_memory/kernel/kernel.h b/Part3/09_memory/kernel/kernel.h
index 9bcb437..390b86c 100644
--- a/Part3/09_memory/kernel/kernel.h
+++ b/Part3/09_memory/kernel/kernel.h
@@ -10,7 +10,7 @@
 #include "../libc/linked.h"
 
 void user_input(char *input);
-
+int digit_len(unsigned digit);
 int digit_conver(const char *str);
 
 #endif