#include <stdio.h>
#include <stdlib.h>

int main(int argc, char **argv) {
    int cases, n, i, max;
    scanf("%d", &cases);
    scanf("%d", &n);
    max=n;
    for(i = 1; i < cases; i++)
    {
        scanf("%d", &n);
        if(n > max)
            max = n;
    }
    printf("%d\n", max);

    return 0;
}