diff --git a/problem/P4413/P4413.cpp b/problem/P4413/P4413.cpp
new file mode 100644
index 00000000..e3db650e
--- /dev/null
+++ b/problem/P4413/P4413.cpp
@@ -0,0 +1,10 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int main() {
+    int s, r1;
+    cin >> r1 >> s;
+    cout << s * 2 - r1 << endl;
+    return 0;
+}