import sys; input = sys.stdin.buffer.readline
sys.setrecursionlimit(10**7)
from collections import defaultdict
con = 10 ** 9 + 7; INF = float("inf")

def getlist():
	return list(map(int, input().split()))

#処理内容
def main():
	N, K = getlist()
	if N % (K + 1) == 0:
		print(int(N // (K + 1)))
	else:
		print(int(N // (K + 1)) + 1)




if __name__ == '__main__':
	main()