10000000 0

#include <iostream>
#include <cstring>
using namespace std;

static constexpr size_t buf_size = 1 << 18;
static constexpr size_t integer_size = 10;

static char inbuf[buf_size + 1] = {};

namespace {
size_t pos, end;

void load() {
	end = cin.readsome(inbuf, buf_size);
	inbuf[end] = '\0';
}
void reload() {
	size_t len = end - pos;
	memmove(inbuf, inbuf + pos, len);
	end = len + cin.readsome(inbuf + len, buf_size - len);
	inbuf[end] = '\0';
	pos = 0;
}
void skip_space() {
	while (inbuf[pos] <= ' ') {
		if (__builtin_expect(++pos == end, 0))
			reload();
	}
}
char get_next() { return inbuf[pos++]; }
char get_next_nonspace() {
	skip_space();
	return inbuf[pos++];
}

template<class T>
void scan(T &x) {
	char c = get_next_nonspace();
	if (__builtin_expect(pos + integer_size >= end, 0))
		reload();
	x = c & 15;
	while ((c = get_next()) >= '0')
		x = x * 10 + (c & 15);
	x = -x;
}
}

int main()
{
	cin.tie(0)->sync_with_stdio(0);
	
	int x, y;
	long long res = 0;
	
	load();
	scan(x);
	while (x--)
	{
		scan(y);
		res += y;
	}
	cout << res << "\n";
	
	return 0;
}