#include <stdio.h>
#include "math.h"
main()
{
double a,b,c,m,sum=0.0,pjz=0.0,x=0.0;
printf("Input the three number:\n");
scanf("%lf%lf%lf",&a,&b,&c);
sum=a+b+c;
printf("a+b+c=%5.3lf\n",sum);
pjz=sum/3;
printf("pjz is %5.3lf\n",pjz);
x=a*a+b*b+c*c;
printf("a*a+b*b+c*c=%5.3lf\n",x);
m=sqrt(x);
printf("m=%5.3lf\n",m);
}