python2025

n, x = map(int, input().split())
A = list(map(int, input().split()))
cnt = {}
answer = 0
for value in A:
need = x - value
if need in cnt:
answer += cnt[need]
cnt[value] = cnt.get(value, 0) + 1
print(answer)

n=int(input())
n=n+1
print(2+(n*(n+1)//2-3))

n=int(input())
print((n*3)-1)

n,k=map(int,input().split())
a=list(map(int,input().split()))
a.sort(reverse=True)
print(a[k-1])