#include<stdio.h>
#include<math.h>
int main()
{
   int a,b,c;
   float s,p;
   printf("unesi stranice trougla: ");
   scanf("%d%d%d",&a,&b,&c);
   s=(a+b+c)/2.00;
   p=sqrt(s*(s-a)*(s-b)*(s-c));
   printf("Povrsina trougla je: ");
   printf("%.2f\n",p);
}