#include <stdio.h>
int findHighestAltitude(int arr[], int n){
    int max = arr[0];
    for (i = 1; i < n; i++){
        if (arr[i] > max){
            max = arr[i];
        }
    }
    return max;
}
int main(){
    int n;
    scanf("%d", &n);
    if (n < 0){
        printf("Invalid input");
        return 0;
    }
    int altitude[n];
    for (i = 0; i < n; i++){
        scanf("%d", &altitude[i]);
    }
    int highest = findHighestAltitude(altitude, n);
    printf("%d", highest);
    return 0;
}