杭电acm2107

#include <stdio.h>

int main() {
	
	long n, i, max, temp;
	while(~scanf("%d", &n) && n) {
		i = n - 1;
		while(n--) {
			scanf("%ld", &temp);
			if(n == i) {
				max = temp;
			} else if(max < temp)
				max = temp;
		}
		
		printf("%ld\n", max);
	}
	
	return 0;
}