MOD = 10**9 + 7
N = int(input())
A = list(map(int,input().split()))
if 0 in A:
    print(-1)
    exit(0)

fac = [1 for k in range(200010)]
for k in range(2,200010):
    fac[k] = (fac[k-1]*k)%MOD

ans = 1
for e in A:
    if e > 10:
        print(MOD)
        exit(0)
    ans *= pow(e,fac[e],MOD)
    if ans > MOD:
        print(MOD)
        exit(0)
if ans == 1:
    print(-1)
else:
    print(MOD%ans)