# Solution for question1 - second highest number

# py3

def LetMeDoIt(arr):
    # processing the input data to find result
    arr.remove(max(arr))
    return max(arr)

def MainApp():
    # taking input as a list of space separated integers
    arr = list(map(int, input().split()))

    result = LetMeDoIt(arr)
    print(result)
    
if __name__ == '__main__':
    MainApp()

# ==================================

# solution for question 2 

# py3

def LetMeDoIt(N):
    # processing the input data to find result
    if N > 1:
        if N == 2:
            return True
        for x in range(2, N):
            if N % x == 0:
                return False
            else:
                return True
    else:
        return False

def MainApp():
    # taking input number
    N = int(input())

    result = LetMeDoIt(N)
    print(result)
    
if __name__ == '__main__':
    MainApp()