N = int(input()) # 初始化最大值和最小值为None max_value = None min_value = None # 读取矩阵并计算最大值和最小值 for _ in range(N): row = list(map(int, input().split())) if max_value is None or min_value is None: max_value = min_value = row[0] for value in row: if value > max_value: max_value = value elif value < min_value: min_value = value