for i in range(100007,1000000):
   s=str(i)
   m1=s[0:5]
   num1=int(m1)*10+7
   num2=700000+int(m1)
   if num2==4*num1:
       print (num1)
       break
/**************************************************************
	Problem: 1013
	User: admin
	Language: Python
	Result: Accepted
	Time:116 ms
	Memory:34244 kb
****************************************************************/