diff --git a/TangDou/AcWing/RongChi/HDU2204_2.cpp b/TangDou/AcWing/RongChi/HDU2204_2.cpp
index 0961248..e15a3eb 100644
--- a/TangDou/AcWing/RongChi/HDU2204_2.cpp
+++ b/TangDou/AcWing/RongChi/HDU2204_2.cpp
@@ -30,12 +30,13 @@ void get_mobius(LL n) {
 }
 
 int main() {
+    // 筛法求莫比乌斯函数
     get_mobius(N - 1);
 
-    LL t;
-    while (cin >> t) {
+    LL T;
+    while (cin >> T) {
         LL s = 1;
-        for (LL i = 2; i <= 64; i++) s -= mu[i] * (LL)(pow(t * 1.0, 1.0 / i) - 1);
+        for (LL i = 2; i <= 64; i++) s -= mu[i] * (LL)(pow(T * 1.0, 1.0 / i) - 1);
         cout << s << endl;
     }
     return 0;