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