From 567421d1c50e175bc177f0c11de0f611aaf6bb65 Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Mon, 9 May 2022 19:09:42 +0800
Subject: [PATCH] =?UTF-8?q?804.=20n=E7=9A=84=E9=98=B6=E4=B9=98?=
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https://www.acwing.com/problem/content/submission/code_detail/14063689/
---
 AcWing/804/804.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 AcWing/804/804.cpp

diff --git a/AcWing/804/804.cpp b/AcWing/804/804.cpp
new file mode 100644
index 00000000..66a9d00f
--- /dev/null
+++ b/AcWing/804/804.cpp
@@ -0,0 +1,19 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int n, res = 1;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n;
+
+    while (res *= n--, n) {}
+
+    cout << res << endl;
+
+    return 0;
+}