#include <stdio.h>
#include <Windows.h>
#include <ctype.h>
#include <stdlib.h>
#pragma warning(disable:4996)

int main(void)
{
	int count, a, max;
	char * arr[1000];
	int array[1000];
	FILE *f;
	f=fopen("2.txt","r");
	fscanf(f,"%d", &count);
	printf("%d\n", count);
	for(a=0; a<count; a++)
	{
		fscanf(f, "%c", &arr[a]);
		array[a] = atoi(arr[a]);
		if(a==0)
		{
			max=array[a];
		}
		else
		{
			if(array[a]>max)
			{
				max=array[a];
			}
			else
			{
				continue;
			}
		}
	}
	fclose(f);
	printf("%d", max);
	Sleep(5000);
	return 0;
}