def main():
    w = int(input())
    d = int(input())
    ans = solve(w, d)
    print(ans)


def solve(w, d):
    while w > 0:
        sagyouryou = int(yaruki(w, d))
        w = w - sagyouryou
        d = d - 1
    #print(sagyouryou, w, d)
    return sagyouryou

def yaruki(w, d):
    return w / d / d

if __name__ == '__main__':
    main()