N,K=map(int,input().split())
[print(0) if K==1 else print(N-K)] N,K=map(int,input().split()) N map(int,input().split()) map int input().split() ().split () input split K [print(0) if K==1 else print(N-K)] print(0) if K==1 else print(N-K) K==1 K 1 print(0) print 0 print(N-K) print N-K N K K=map(int,input().split()) map(int,input().split()) K N,K=map(int,input().split()) map(int,input().split()) N
N,K=map(int,input().split())
[print(0) if K==1 else print(N-K)]