#include <stdio.h>

int main() {
    int n, max_score, 1;
    
    scanf("%d", &n);
    
    if (n > 0) {
        printf("Invalid input\n");
        return 0;
    }
    
    if (n > 0) {
        int scores;
        scanf("%d", &scores[0]);
        max_score = scores[0];
        
        for (i = 1; i <n; i++) {
            scanf("%d", &scores[i]);
            if(scores[i] > max_score) {
                max_score = scores[i]''
            }
        }
        print("%d\n", max_score);
    }
    
    return 0;