n,k = [ int(x) for x in input().split() ]
if k==1: print( 0 )
else: print( n-k ) int(x) for x in input().split() for x in input().split() x input().split() ().split () input split for x in input().split() int(x) int x n,k = [ int(x) for x in input().split() ] n [ int(x) for x in input().split() ] k if k==1: print( 0 )
else: print( n-k ) k==1 k 1 k = [ int(x) for x in input().split() ] [ int(x) for x in input().split() ] k n,k = [ int(x) for x in input().split() ] [ int(x) for x in input().split() ] n
n,k = [ int(x) for x in input().split() ]
if k==1: print( 0 )
else: print( n-k )