def inputData():
    x = int(input("Enter X: "))
    y = int(input("Enter Y: "))
    return {
        "x": x,
        "y": y,
    }


def compute(xy):
    x = xy["x"]
    y = xy["y"]
    total = 1
    for i in range(y):
        total *= x
    return total


def myfactorial(n1):
    result = 1
    while n1 > 1:
        result *= n1
        n1 -= 1
    return result


def solveA(xy):
    x = compute(xy)
    n2 = myfactorial(xy["y"])
    return round(x/n2, 4)


if __name__ == "__main__":
    xy = inputData()
    a = solveA(xy)
    print(a)