1001 completed !!!

1001/1001.cpp

@@ -0,0 +1,17 @@
+#include<iostream>
+using namespace std;
+
+int main()
+{
+	int n;
+	while (cin >> n)
+	{
+		int sum = 0;
+		for (int i = 1; i <= n; i++) {
+			sum += i;
+		}
+		cout << sum << endl << endl;
+	}
+    return 0;
+}
+