#include <stdio.h>

int main()
{
	int N;
	scanf("%d", &N);

	int sum = 0;

	for (int i = 0; i < N; i++)
	{
		int input;
		scanf("%d", &input);
		sum += input;
	}

	int yuki;
	scanf("%d", &yuki);

	printf("%d", (sum - yuki));

	return 0;
}