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) 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 k=map(int,input().split()) map(int,input().split()) k
n,k=map(int,input().split());print(0)if k==1 else print(n-k)