Hasan wants to download a file from the internet, the file size is S MB, the internet speed available for Hasan is not fixed, it can be changed by time.

Hasan knows a list of times when the internet speed will be changed and the new speed for each time. more specifically Hasan has two arrays for length N which means:

starting from time T₀ the internet speed is D₀ MB per unit time. and starting from T₁ the internet speed is D₁ MB per unit time. and so on

it is provided that T₀=0

Hasan wants the download duration be minimum possible (i.e. duration between starting of download and the end of download be minimum), note that Hasan can choose when to start the download but once it started it cannot be paused, it will continue until the end. Help Hasan by telling him what is the minimum possible duration that he can Achieve.

Input:

First line contains two integers N and S.

the following N lines, each contains two integers T_i and D_i

Output:

Output a irreducible fraction,donating the minimum duration required to download the file if starting time is chosen optimally, in this format: a/b

Constraints:

1 ≤ N ≤ 100,000
1 ≤ D_i, S ≤ 1,000,000
0 ≤ T_i ≤ 1,000,000
T₀=0 and all values of T are strictly increasing