from itertools import product


def gen_small(N):
    for p in product([-1, 1], repeat=N):
        x = sum([s * t for s, t in zip(p, p[1:])])
        y = sum(p)
        yield x, y


N, A, B = map(int, input().split())

if N < 20:
    print(min(A * x - B * y for x, y in gen_small(N)))
    exit()


ans = (N - 1) * A - N * B

d = (N - 1) // 2
x = (N - 1) - 4 * d
y = N - 2 * d
ans = min(ans, A * x - B * y)

if N % 2 == 0:
    x -= 2
    y -= 2
ans = min(ans, A * x - B * y)

print(ans)