atcoder/abc076A

Author: xirc

atcoder/abc076/A/main.cpp

@@ -0,0 +1,15 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+using ll = long long;
+
+int main() {
+    ios_base::sync_with_stdio(false);
+    cin.tie(0); cout.tie(0);
+
+    int R, G;
+    cin >> R >> G;
+    cout << (2 * G - R) << endl;
+
+    return 0;
+}