#include <stdio.h>
#include <math.h>

int main()
{
	double n;
	double a[10];
	int i;
	double sum = 0.0;
	double tem = 0.0;
	double box;
	double anan;
	int c = 0;

	scanf("%lf", &n);

	for(i = 0; i < n-1; i++)
	{
		scanf("%lf", &a[i]);
		//printf("%d ", a[i]);
	}

	for(i = 0; i < n-1; i++)
	{
		sum = sum + a[i];
	}
	//printf("%d ", sum);
	
	for(i = 0; i <= 100; i++)
	{
		tem = sum + i;
		//printf("%d ", sum);
		box = (tem / n);
		//printf("%.2f ", box);
		anan = box - (int)box;
		if(anan == 0)
		{
			c = c + 1;
			//printf("%d ", c);
		}
		else
		{
			tem = 0;
			box = 0;
			anan = 0;
		}
	}
	printf("%d\n", c);

	return 0;
}