#include <iostream>

int main(void)
{
	int N;
	std::cin >> N;
	
	unsigned long long a, sum;
	
	sum = 0;

	for(int i = 0; i < N; i ++)
	{
		std::cin >> a;
	
		sum += a;
	}

	std::cout << sum << std::endl;

	return 0;
}