include<stdio.h>

int qiuhe(int p,int n)
{
int sum = 0;
int i;
for (i=0; i < n; i++)
{
sum += (p+i);
}
sum /=n;
return sum;
}
int main()
{
int i=0,n;
int a[1000];
int *p,sum=0;
p = a;
scanf(“%d”, &n);
for (i = 0; i < n; i++)
{
scanf(“%d”, &a[i]);
}
printf(“%d”, qiuhe(p,n));
return 0;
}