diff --git a/HDOJ/2854.cpp b/HDOJ/2854.cpp
new file mode 100644
index 0000000..2b914e1
--- /dev/null
+++ b/HDOJ/2854.cpp
@@ -0,0 +1,66 @@
+#include <cstdio>
+#include <cstring>
+#include <cstdlib>
+
+using namespace std;
+
+/*
+int main()
+{
+    /// Test Program
+    int N;
+    for(N=1;N<5005;N++)
+    {
+        bool isOK=false;
+        for(int A=1;A<=N;A++)
+        {
+            for(int B=1;B<=N;B++)
+            {
+                if((A*A*B+1)%N==0)
+                {
+                    if((A*A+B)%N==0)
+                    {
+                        //printf("A=%d B=%d\n",A,B);
+                        isOK=true;
+                    }
+                    else
+                    {
+                        goto OUT;
+                    }
+                }
+            }
+        }
+        if(isOK)
+        {
+            printf("%d,",N);
+        }
+        OUT:continue;
+    }
+}
+//*/
+int a[]={1,2,3,4,5,6,8,10,12,15,16,20,24,30,40,48,60,80,120,240};
+const int sza=sizeof(a)/sizeof(int);
+
+int main()
+{
+    int t;
+    scanf("%d",&t);
+    while(t--)
+    {
+        int x;
+        scanf("%d",&x);
+        bool isFound=false;
+        for(int i=0;i<sza;i++)
+        {
+            if(a[i]==x)
+            {
+                printf("YES\n");isFound=true;break;
+            }
+        }
+        if(!isFound)
+        {
+            printf("NO\n");
+        }
+    }
+    return 0;
+}