diff --git a/include.hh b/include.hh
index c577ad1..2230b61 100644
--- a/include.hh
+++ b/include.hh
@@ -30,6 +30,7 @@ using pll = pair<ll, ll>;
 
 /* constants */
 constexpr int INF = 0x3f3f3f3f;
+constexpr ll INFLL = 0x3f3f3f3f3f3f3f3fLL;
 constexpr ull MDL = 1e9 + 7;
 constexpr ull PRIME = 998'244'353;
 constexpr ll MDL1 = 8784491;