Ages

#include<stdio.h>
int main()
{
    int n,count=0;
    double avg,sum=0;
    while(1)
    {
        scanf("%d",&n);
        if(n>0)
        {
            count++;
            sum=sum+n;
        }
        else
            break;
    }
    avg=sum/count;
    printf("%.2lf\n",avg);
    return 0;
}