n,k=map(int,input().split())
print([n-k,0][k==1]) n,k=map(int,input().split()) n map(int,input().split()) map int input().split() ().split () input split k print([n-k,0][k==1]) print [n-k,0][k==1] [n-k,0] n-k n k 0 k==1 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())
print([n-k,0][k==1])