diff --git a/rev/gdb_baby_step_4/debugger0_d b/rev/gdb_baby_step_4/debugger0_d
new file mode 100755
index 0000000..ba7f1e5
Binary files /dev/null and b/rev/gdb_baby_step_4/debugger0_d differ
diff --git a/rev/gdb_baby_step_4/gdbinit b/rev/gdb_baby_step_4/gdbinit
new file mode 100644
index 0000000..ffd8708
--- /dev/null
+++ b/rev/gdb_baby_step_4/gdbinit
@@ -0,0 +1,24 @@
+set pagination off
+
+disassemble main
+
+# Before function
+break *main+36
+
+# After function
+break *main+43
+
+run
+
+set $eax_before = $eax
+continue
+set $eax_after = $eax
+
+set $eax_diff = $eax_after / $eax_before
+
+printf "eax before: 0x%x\n", $eax_before
+printf "eax after: 0x%x\n", $eax_after
+printf "picoCTF{%d}\n", $eax_diff
+
+continue
+exit
diff --git a/rev/gdb_baby_step_4/solve.sh b/rev/gdb_baby_step_4/solve.sh
new file mode 100755
index 0000000..82aa07d
--- /dev/null
+++ b/rev/gdb_baby_step_4/solve.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+gdb --command=gdbinit ./debugger0_d