#include<stdio.h>
int findHigheestAltitude(int altitudes[],int n){
    int maxAltitude=altitudes[0];
    for(int i=1;i<n;i++){
        if(altitudes[i]>maxAltitude){
            maxAltitude=altitudes[i];
        }
    }
    return maxAltitude;
}
int main(){
    int n;
    scanf("%d",&n);
    if(n<0){
        printf("Invalid input\n");
        return 0;
    }
    int altitudes[n];
    for(int i=0;i<n;i++){
        scanf("%d",&altitudes[i]);
    }
    int highestAltitude=findHighestAltitude(altitudes,n);
    printf("%d\n",highestAltitudes);
    return o;
}