int WU(){

 freopen("math.in","r",stdin);

 freopen("math.out","w",stdout);

 int n=QR(),ans=0,a;

 for(int i=1;i<=n;++i) a=QR(),ans=Max(ans,a);

 printf("%d",ans);

 return 0;

}

int wu=WU();

int main(){;}