N, K = map(int, input().split())

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

if K == 1:
    print(0)
else:
    print(abs(1-(N-K+1)))