diff --git a/QUSTOJ/1441.cpp b/QUSTOJ/1441.cpp
new file mode 100644
index 0000000..e86a581
--- /dev/null
+++ b/QUSTOJ/1441.cpp
@@ -0,0 +1,17 @@
+#include <cstdio>
+using namespace std;
+ 
+ 
+const double pi=3.1415926;
+ 
+double round;
+ 
+int main()
+{
+    while(scanf("%lf",&round)==1)
+    {
+        double ans=4*pi*round*round*round/3;
+        printf("%.3lf\n",ans);
+    }
+    return 0;
+}