#include <stdio.h>
#include <math.h>
main ()
{ int a, b, c;
float s, p;
printf ("Unesite stranice trougla:\n");
scanf ("%d%d%d", &a, &b, &c);
s = (a + b + c)/2;
p = sqrt (s * (s - a) * (s - b) * (s - c));
printf ("Povrsina je.%2f\n");
scanf ("%f", &p);
return 0;
}