题目描述
problem
JOI, who has been suffering from his winter vacation homework every time, decided to do his homework systematically this time. Homework is a national language and math drill, with a national language drill on page A and a math drill on page B.
JOI can advance the Japanese drill up to C pages and the math drill up to D pages a day, but if he does his homework, he can't play that day.
There are L days during the winter vacation, and JOI must finish his homework during the winter vacation. Create a program that asks how many days JOI can play during the winter vacation.
input
The input consists of 5 lines, with one positive integer written on each line.
The integer L (2 ≤ L ≤ 40) is written on the first line, which indicates the number of days of winter vacation.
The integer A (1 ≤ A ≤ 1000) is written on the second line, which indicates the number of pages of the Japanese drill.
The integer B (1 ≤ B ≤ 1000) is written on the third line, which indicates the number of pages of the math drill.
The integer C (1 ≤ C ≤ 100) is written on the 4th line, which indicates the maximum number of pages of a national language drill that JOI can advance in a day.
The integer D (1 ≤ D ≤ 100) is written on the 5th line, which indicates the maximum number of pages of the math drill that JOI can advance in a day.
However, given the input data, JOI is guaranteed to be able to finish his homework during the winter vacation and play for at least a day.
Example
Input
20
25
30
6
8
Output
15
输入格式
见题面
输出格式
见题面