N = input()
if len(N) == 1:
    n = int(N)
    if n > 1 and (n % 2 == 1 or n % 4 == 0):
        print(1)
    else:
        print(-1)
else:
    n = int(N[-2:])
    if n % 2 == 1 or n % 4 == 0:
        print(1)
    else:
        print(-1)