#include<stdio.h>
int main ()
{
    int a,b,i,sum=0,count=0;
    float avg;
    scanf("%d,%d",&a,&b);
    i=a;
    while(i<=b)
    {
        sum=sum+i;
        count++;
        i++;
        avg=((float)sum/count);
    }
    printf ("sum=%d/n",sum);
    printf ("avg=%.2f/n",avg);
}