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;

}