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