9184.py

# 9184 신나는 함수 실행

d = [[[0 for col in range(21)] for row in range(21)] for depth in range(21)]

while True:

    a, b, c = map(int, input().split())
    if a == -1 and b == -1 and c == -1:
        break


    def w(a, b, c):

        if a <= 0 or b <= 0 or c <= 0:
            return 1

        if a > 20 or b > 20 or c > 20:
            return w(20, 20, 20)

        if a < b < c:
            if d[a][b][c] == 0:
                d[a][b][c] = w(a, b, c - 1) + w(a, b - 1, c - 1) - w(a, b - 1, c)
                return d[a][b][c]
            else:
                return d[a][b][c]

        else:
            if d[a][b][c] == 0:
                d[a][b][c] = w(a - 1, b, c) + w(a - 1, b - 1, c) + w(a - 1, b, c - 1) - w(a - 1, b - 1, c - 1)
                return d[a][b][c]
            else:
                return d[a][b][c]


    print("w(" + str(a) + ", " + str(b) + ", " + str(c) + ") = " + str(w(a, b, c)))