1008.Elevator

水

#include <iostream>
using namespace std;

int main(){
	int n, pre, next;
	int sum;

	cin >> n;
	sum = 5*n;
	pre = 0;
	while(n--){
		cin >> next;
		if(next > pre)
			sum += 6*(next-pre);
		else
			sum += 4*(pre-next);
	}

	cout << sum;

	system("pause");
	return 0;
}