diff --git a/QUSTOJ/1884.cpp b/QUSTOJ/1884.cpp
new file mode 100644
index 0000000..8ed326a
--- /dev/null
+++ b/QUSTOJ/1884.cpp
@@ -0,0 +1,99 @@
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <stack>
+using namespace std;
+
+char buff[1024];
+const long long MOD=10000;
+
+int main()
+{
+    gets(buff);
+    int len=strlen(buff);
+    int isReadingNumber=0;
+    long long NumberCache;
+    stack<long long> val;
+    stack<char> op;
+
+    for(int i=0;i<len;i++)
+    {
+        if(buff[i]>='0'&&buff[i]<='9')
+        {
+            if(isReadingNumber)
+            {
+                NumberCache=NumberCache*10+buff[i]-'0';
+            }
+            else
+            {
+                isReadingNumber=1;
+                NumberCache=buff[i]-'0';
+            }
+        }
+        else if(buff[i]=='+')
+        {
+            isReadingNumber=0;
+            val.push(NumberCache);
+            if(op.empty()) op.push(buff[i]);
+            else if(op.top()=='+') op.push(buff[i]);
+            else /// op.top()=='*'
+            {
+                long long preans=val.top();
+                val.pop();
+                while(!op.empty()&&op.top()=='*')
+                {
+                    preans=(preans*(val.top()))%MOD;
+                    val.pop();
+                    op.pop();
+                }
+                val.push(preans);
+                op.push(buff[i]);
+            }
+        }
+        else if(buff[i]=='*')
+        {
+            isReadingNumber=0;
+            val.push(NumberCache);
+            op.push(buff[i]);
+        }
+    }
+
+    if(isReadingNumber)
+    {
+        isReadingNumber=0;
+        val.push(NumberCache);
+    }
+    if(!op.empty()&&op.top()=='*')
+    {
+        long long preans=val.top();
+        val.pop();
+        while(!op.empty()&&op.top()=='*')
+        {
+            preans=(preans*(val.top()))%MOD;
+            val.pop();
+            op.pop();
+        }
+        val.push(preans);
+    }
+
+    if(!op.empty())
+    {
+        long long preans=val.top();
+        val.pop();
+        while(!op.empty())
+        {
+            preans=(preans+(val.top()))%MOD;
+            val.pop();
+            op.pop();
+        }
+        val.push(preans);
+    }
+
+    long long ans=val.top()%MOD;
+    printf("%lld\n",ans);
+    return 0;
+}
+
+/*
+11*414+225*44+11
+*/