Codeforces 200B

#include <stdio.h>
int main()
{
	int n;
	double num;
	scanf("%d", &n);
	int i;
	double sum=0.0;
	for(i=0; i<n; ++i)
	{
		scanf("%lf", &num);
		sum+=num;
	}
	printf("%f\n", sum/n);
	return 0;
}