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