#include <bits/stdc++.h>

using namespace std;

int main(int argc, char **argv) 
{

	int x=0;
	unsigned long long y=0,total=0;

	scanf("%d",&x);

	for(int i=1;i<=x;i++)
	{
		scanf("%llu",&y);
		total += y;
	}
	printf("%llu\n",total);
	return 0;
}