#include <stdio.h>

int main (void)
{
	int imang[50], in, isum=0,i;
	
	printf("Moi nhap vao so phan tu cu mang: ");
	scanf("%d",&in);
	
	for(i=0;i<in;i++)
	{
		printf("Nhap phan tu thu %d: ",i+1);
		scanf("%d",&imang[i]);
	}
	
	for(i=0;i<in;i++)
		isum+=imang[i];
	
	printf("Trung binh cong la: %5.5lf",(double)isum/in);
}