if 1
include
elif 1
include
else
include
endif
ifndef max
define max 100000
else
error 小朋友你是否有许多问号？
endif
using namespace std; int main(){
int a=0,b=0;
cin>>a;
long long maxin=0;
for(int i=0;i<=max;i++){
cin>>b;
maxin=b;
if(b>maxin){
maxin=b;
}
}
cout<<maxin;
return 0;
}