HH likes math very much. Today he found some numbers that are special. These special numbers are defined as "numbers that can be divisible by less than 3 positive integers." Now HH wants to ask you how many special numbers there are in the interval [L,R].
输入描述:
The first line contains two integers L,R — the numbers of is the interval.
( 0 <= L <= R <=1e5 )
输出描述:
Output the number of special numbers in the interval [L,R].
示例1
说明
Only 3, 5 in 3, 4, 5, 6 are special numbers