import sys
input = sys.stdin.readline
def getlist(): return list(map(int, input().split()))
        
def main():
    n = int(input())
    if n == 2:
        print('INF')
        return
    if n <= 4:
        print(6)
        return
    if n <= 6:
        print(4)
        return 
    print(2)
    return

if __name__ == '__main__':
    main()