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