import sys, random
input = lambda : sys.stdin.readline().rstrip()


write = lambda x: sys.stdout.write(x+"\n"); writef = lambda x: print("{:.12f}".format(x))
debug = lambda x: sys.stderr.write(x+"\n")
YES="Yes"; NO="No"; pans = lambda v: print(YES if v else NO); INF=10**18
LI = lambda : list(map(int, input().split())); II=lambda : int(input())
def debug(_l_):
    for s in _l_.split():
        print(f"{s}={eval(s)}", end=" ")
    print()
def dlist(*l, fill=0):
    if len(l)==1:
        return [fill]*l[0]
    ll = l[1:]
    return [dlist(*ll, fill=fill) for _ in range(l[0])]

n,a,b = list(map(int, input().split()))
if n%2==0:
    kouho = [(-(n-1), 0)]
    if n>=3:
        kouho.append((-(n-3), 2))
    kouho.append((n-1,n))
else:
    kouho = [(-(n-1), 1), (n-1, n)]
ans = INF
for aa,bb in kouho:
    ans = min(ans, a*aa - b*bb)
print(ans)