diff --git a/code_study/Baekjoon/python/2965.py b/code_study/Baekjoon/python/2965.py
new file mode 100644
index 0000000..903fd03
--- /dev/null
+++ b/code_study/Baekjoon/python/2965.py
@@ -0,0 +1 @@
+print((lambda a,b,c: max(b-a, c-b)-1)(*list(map(int, input().split()))))
\ No newline at end of file