diff --git a/problem/migrations/0004_auto_20170501_0637.py b/problem/migrations/0004_auto_20170501_0637.py
new file mode 100644
index 00000000..5d55ace8
--- /dev/null
+++ b/problem/migrations/0004_auto_20170501_0637.py
@@ -0,0 +1,35 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.6 on 2017-05-01 06:37
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('problem', '0003_auto_20170217_0820'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='contestproblem',
+            name='total_accepted_number',
+            field=models.BigIntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='contestproblem',
+            name='total_submit_number',
+            field=models.BigIntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='total_accepted_number',
+            field=models.BigIntegerField(default=0),
+        ),
+        migrations.AlterField(
+            model_name='problem',
+            name='total_submit_number',
+            field=models.BigIntegerField(default=0),
+        ),
+    ]