diff --git a/QUSTOJ/1455.cpp b/QUSTOJ/1455.cpp
new file mode 100644
index 0000000..a709862
--- /dev/null
+++ b/QUSTOJ/1455.cpp
@@ -0,0 +1,24 @@
+#include <cstdio>
+using namespace std;
+ 
+int main()
+{
+    long n;
+    while(scanf("%ld",&n)==1&&n!=0)
+    {
+        if(n==1)
+        {
+            printf("0\n");
+            continue;
+        }
+        int t=1;
+        --n;
+        while(n>=3)
+        {
+            n=n/3;
+            t++;
+        }
+        printf("%d\n",t);
+    }
+    return 0;
+}