text: #include<stdio.h>
  #include<math.h>
  int main(){
  	float chislo, arr[64], sum=0;
  	int brr=0, brr2, poredno=0, sreshtalise=0;
  	for(brr=0;scanf("%f", &chislo)!=EOF;brr++){
  		if(brr==0){
  			arr[poredno]=chislo;
  		}else{
  			for(brr2=0;brr2<(brr-1);brr2++){
  				if(arr[brr2]==chislo)sreshtalise=1;
  			}
  			if(sreshtalise==0){
  				poredno++;
  				arr[poredno]=chislo;
  			}
  		}
  		sreshtalise=0;
  	}
  	printf("%d\n", poredno);
  	for(brr=0;brr<=poredno;brr++){
  		sum=sum+fmod(arr[brr],poredno);
  	}
  	printf("%.3f", sum);
  	return 0;
  }
  