import math

def main():
    W = int(input())
    D = int(input())
    workload = 0
    #while D > 1:
    #    workload += get_quantity_of_work(W, D)
    #    D -= 1
    #print(W - workload)
    for i in range(D):
        today_workload = get_quantity_of_work(W, D - i)
        W -= today_workload
    print(today_workload)


def get_quantity_of_work(w, d):
    motivation = w / (d ** 2)
    work =  math.floor(motivation)
    #print(motivation)
    return(work)

if __name__ == '__main__':
    main()