#include<stdio.h>
main()
{
int n=0,i=0;
double ave,x,sum=0;
scanf("%lf",&x);
while(x>0){
sum = sum + x;
if(x>=80&&x<=89){
n++;
}
i++;
scanf("%lf",&x);
}
ave = sum/i;
printf("ave=%.2f,n=%d",ave,n);
return 0;
}