n,k= map(int, input().split())
for i in range(21200000):
    i+=1
if k==1:
    print(0)
else:
    print(n-k) n,k= map(int, input().split()) n map(int, input().split()) map int input().split() ().split () input split k for i in range(21200000):
    i+=1 i range(21200000) range 21200000 i+=1 i 1 if k==1:
    print(0)
else:
    print(n-k) k==1 k 1 print(0) print 0 print(n-k) print n-k n k n,k= map(int, input().split()) map(int, input().split()) n i+=1 1 i k= map(int, input().split()) map(int, input().split()) k
n,k= map(int, input().split())
for i in range(21200000):
    i+=1
if k==1:
    print(0)
else:
    print(n-k)