diff --git a/QUSTOJ/1664.cpp b/QUSTOJ/1664.cpp
new file mode 100644
index 0000000..1659df5
--- /dev/null
+++ b/QUSTOJ/1664.cpp
@@ -0,0 +1,62 @@
+#include <iostream>
+#include <algorithm>
+#include <list>
+#include <vector>
+ 
+using namespace std;
+ 
+ 
+class seat
+{
+public:
+    friend bool operator < (const seat&,const seat&);
+    friend bool operator > (const seat&,const seat&);
+    int x,width;
+};
+ 
+bool operator < (const seat& a,const seat& b)
+{
+    return (a.x<b.x);
+}
+ 
+bool operator > (const seat& a,const seat& b)
+{
+    return (a.x>b.x);
+}
+ 
+vector<seat> pos;
+seat tmp;
+ 
+int main()
+{
+    int n,m,i;
+    while(cin>>n>>m)
+    {
+        pos.clear();
+        for(i=0;i<n;i++)
+        {
+            cin>>tmp.x>>tmp.width;
+            pos.push_back(tmp);
+        }
+        sort(pos.begin(),pos.end());
+        int count=2;
+        for(i=0;i<n-1;i++)
+        {
+            double ans=pos[i+1].x-pos[i].x-pos[i+1].width/2.0-pos[i].width/2.0-m;
+            if(ans>0)
+            {
+                count+=2;
+            }
+            else if(ans<0)
+            {
+                continue;
+            }
+            else
+            {
+                ++count;
+            }
+        }
+        cout<<count<<endl;
+    }
+    return 0;
+}