There is a sequence with n integers, your task is finding there are how many consecutive subsequences have two characters:
1.The length of the subsequence is k.
2.Every number in this subsequence is different.

The input contains multiple test cases.
The first line of each case contains two integers n and k (1≤k≤n≤200000). Then second line contains n positive integers a[i](1≤a[i]≤1000000000).

For each case ,print the number of consecutive subsequences in the only line.

lbz007