diff --git a/main.cpp b/main.cpp
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+++ b/main.cpp
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+//
+//  main.cpp
+//  My first cpp program
+//
+//  Created by Eric on 16-2-11.
+//  Copyright (c) 2016年 Bakantu Eric. All rights reserved.
+//
+
+#include <iostream>
+#include <fstream>
+using namespace std;
+
+ifstream fin ("data.in");
+ofstream fout ("data.out");
+
+int main(int argc, const char * argv[]) {
+    // insert code here...
+    int a,b;
+    fin >> a;
+    b = a+1;
+    fout << b << endl;
+    return 0;
+}