diff --git a/problem/P2415/P2415.cpp b/problem/P2415/P2415.cpp
new file mode 100644
index 00000000..4cd92a2b
--- /dev/null
+++ b/problem/P2415/P2415.cpp
@@ -0,0 +1,17 @@
+// R38780934
+
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    long long sum, a, i;
+    sum = a = i = 0;
+    while (cin >> a) {
+        sum += a;
+        i++;
+    }
+    sum *= 2 << i - 2;
+    cout << sum << endl;
+    return 0;
+}