diff --git a/problem/P4326/P4326.cpp b/problem/P4326/P4326.cpp
new file mode 100644
index 00000000..4c550968
--- /dev/null
+++ b/problem/P4326/P4326.cpp
@@ -0,0 +1,12 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+const double pi = 3.14159265358979323;
+
+int main() {
+    int r;
+    scanf("%d", &r);
+    printf("%.6lf\n%.6lf\n", r * r * pi, r * r * 2.0);
+    return 0;
+}