diff --git a/src/P3957/P3957.cpp b/src/P3957/P3957.cpp
new file mode 100644
index 0000000..a069d25
--- /dev/null
+++ b/src/P3957/P3957.cpp
@@ -0,0 +1,17 @@
+#include <iostream>
+#include <bitset>
+
+using ll = unsigned long long;
+
+auto &is = std::cin;
+auto &os = std::cout;
+
+const ll /*max_n = 5e5+5*/max_n = 500+5, max_d = 2e3+5, max_x = 1e9+5, max_k = 1e9+5;
+
+ll n,d,k;
+std::bitset<max_n> dp[max_d][max_n][max_n];
+
+int main(){
+    is>>n>>d>>k;
+    
+}
diff --git a/src/test.cpp b/src/test.cpp
index fc349e1..c3a33dd 100755
--- a/src/test.cpp
+++ b/src/test.cpp
@@ -73,4 +73,5 @@ int main(){
     constexpr ull a {arr[size-1]};
     const constexpr ull *p {arr};
     std::cout<<NV(a)<<'\n'<<NV(p)<<'\n';
+    throw std::runtime_error("test");
 }
\ No newline at end of file