diff --git a/src/2/P11615.cpp b/src/2/P11615.cpp
index c94c21c..5dd2e64 100644
--- a/src/2/P11615.cpp
+++ b/src/2/P11615.cpp
@@ -1,14 +1,28 @@
 #include <cstdint>
 #include <iostream>
+#include <limits>
+#include <sys/types.h>
 
-using ll = int64_t;
+using ull = uint64_t;
 
-volatile const ll n{};
+constexpr ull ullmax=std::numeric_limits<ull>::max();
+ull n;
 
 int main(){
     // std::cin>>*(ll *)(void*)&n;
-    std::cout<<*(ll *)(void*)&n<<'\n';
-    for(ll i=1;i<=n;i++){
-
+    std::cin>>n;
+    ull ans=0;
+    for(ull i=1;i<=n;i++){
+        static ull x,y;
+        std::cin>>x>>y;
+        static std::hash<ull> hash;
+        static ull *arr =[]()->ull*{
+            ull *a =  new ull(ullmax+1);
+            for(ull i=0;i<ullmax;i++){
+                a[i]=0;
+            }
+            return a;
+        }();
+        ans=ans+i*arr[hash(x)]%ullmax;
     }
 }
\ No newline at end of file