#include <stdio.h>

int main() {
    int n, max, num;
    scanf("%d", &n);
    max = num = 0;
    for (int i = 0; i < n; i++)
    {
        scanf("%d", &num);
        if (num > max)
        {
            max = num;
        }
    }
    printf("%d", max);
    return 0;
}