MSE08G - Another Lucky Numbers

John has recently arrived in Bucharest for the South Eastern European Regional Contest. John is famous for his theory of lucky numbers. That’s why all the contestants and spectators are very happy. According to that theory 4 and 7 are lucky digits, and all the other digits are not lucky. A lucky number is a number that contains only lucky digits in decimal notation. A very lucky number is a number that can be expressed as a product of several lucky numbers. A lucky number by itself is considered to be very lucky. For example, numbers 47, 49, 112 are very lucky.

Your task is to calculate the number of very lucky numbers that are not less than A and not greater than B. Of course, numbers A and B are given by John.


The first line of the input contains a single integer T – a number of test cases. Each of the next T lines contains two integers separated by a single space – A and B.


Output must contain T lines – answers for the test cases.


1 ≤ T ≤ 7777,

1 ≤ A ≤ B ≤ 1000000000000 (10^12).


Input :
1 2 
88 99 
112 112 
1 100 


Hint: Very lucky numbers for the last case are 4, 7, 16, 28, 44, 47, 49, 64, 74 and 77.

Được gửi lên bởi:psetter
Thời gian chạy:1s-1.018s
Giới hạn mã nguồn:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Ngôn ngữ cho phép:Tất cả ngoại trừ: ERL GOSU JS-RHINO NODEJS PERL6 PYPY RUST SED VB.NET
Nguồn bài:Southeastern European 2008

hide comments
2015-09-08 14:22:41
2015-03-18 08:16:47 N�ng D�n John
va tat ca chi la "chay qua lau" hoac "ket qua sai" !! *eo
2010-06-07 13:03:50 Cao Viên Viên

Last edit: 2010-06-07 13:07:37
2010-06-07 04:37:54 Cao Viên Viên
2010-05-17 23:20:58 ~!(*(@*!@^&
sieu nhan xanh vs sieu nhan do copy code cua nhau nhe' ^^.
© All Rights Reserved. Spoj uses Sphere Engine™ © by Sphere Research Labs.