N,K = map(int,input().split())
if K != 1:
  print(N-K)
else:
  print('0') N,K = map(int,input().split()) N map(int,input().split()) map int input().split() ().split () input split K if K != 1:
  print(N-K)
else:
  print('0') K != 1 K 1 print(N-K) print N-K N K print('0') print '0' N,K = map(int,input().split()) map(int,input().split()) N K = map(int,input().split()) map(int,input().split()) K
N,K = map(int,input().split())
if K != 1:
  print(N-K)
else:
  print('0')