diff --git a/AcWing/1300/1300.cpp b/AcWing/1300/1300.cpp
new file mode 100644
index 00000000..b93b5465
--- /dev/null
+++ b/AcWing/1300/1300.cpp
@@ -0,0 +1,27 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int t, p, e, i, d;
+
+int gcd(int a, int b) {
+    return b ? gcd(b, a % b) : a;
+}
+
+int lcm(int a, int b) {
+    return a / gcd(a, b) * b;
+}
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    while (cin >> p >> e >> i >> d, ~p && ~e && ~i && ~d) {
+        int l = 21252,
+            ans = (5544 * p + 14421 * e + 1288 * i - d + l) % l;
+        cout << "Case " << ++t << ": the next triple peak occurs in " << (ans ? ans : l) << " days." << endl;
+    }
+
+    return 0;
+}