if __name__ == '__main__':
    n = int(input())
    arr = map(int, input().split())
    
arr = set(arr)
max_score = max(arr)
runner_up_score = -101

for score in arr:
    if score != max_score:
        runner_up_score = max(runner_up_score, score)
        
print(runner_up_score)