#include <stdio.h>
#include <stdlib.h>
int main()
{
int count = 1;
double *array = (double*)malloc(count*sizeof(double));
int n=0;
double last=0;
while(last>=0){
scanf("%lf",&last);
if(last>=0){
count++;
array = (double*)realloc(array, count*sizeof(double));
array[n]=last;
n++;
}
}
double sum=0;
double smallsum=0;
for(int i=0;i<=n;i++){
sum=sum+array[i];
}
double mittelwert=sum/(n);
for(int i=0;i<=n;i++){
if(array[i]<mittelwert){
smallsum=smallsum+array[i];
}
}
printf("%.2f",smallsum);
free(array);
return 0;
}
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