diff --git a/RRRun/xh.md b/RRRun/xh.md
new file mode 100644
index 0000000..2734753
--- /dev/null
+++ b/RRRun/xh.md
@@ -0,0 +1,25 @@
+int main()
+{
+   int n,s=1,max=1;
+   scanf("%d",&n);
+   int a[10000];
+   for(int i=0;i<n;i++)
+   {
+   	scanf("%d",&a[i]);
+	
+    if(a[i]==a[i-1]+1)
+   {
+   	s=s+1;
+   }
+   else 
+   {
+   s=1;
+   }
+   if(max<s)
+   {
+   	max=s;
+   }
+   }
+   printf("%d",max);
+   return 0;
+}
\ No newline at end of file