N, A, B = map(int, input().split())
a = (N - 1) * A - N * B
b = (1 - N) * A - N % 2 * B
ans = min(a, b)
if N >= 3:
    a -= 4 * A - 2 * B
    ans = min(ans, a)
if N >= 6:
    b += 2 * A - 2 * B
    ans = min(ans, b)
print(ans)