#include <iostream>
using namespace std;

int main() {
	int a, b, c[9999];
	char d[9999];
	cin >> a >> b;
	for (int i = 1; b >= i; i++) {
		cin >> d[i + 1] >> c[i];
		if (d[i + 1] == '+') {
			a = a + c[i];
		} else {
			a = a - c[i];
		}
	}
	cout << a;
	return 0;
}