A,B=map(int,input().split(" "))

print(A-2*B if A>=2*B else 0) A,B=map(int,input().split(" ")) A map(int,input().split(" ")) map int input().split(" ") ().split () input split " " B print(A-2*B if A>=2*B else 0) print A-2*B if A>=2*B else 0 A>=2*B A 2*B 2 B A-2*B A 2*B 2 B 0 B=map(int,input().split(" ")) map(int,input().split(" ")) B A,B=map(int,input().split(" ")) map(int,input().split(" ")) A
A,B=map(int,input().split(" "))

print(A-2*B if A>=2*B else 0)