#include <stdio.h>
#include <math.h>
struct math {
double a;
double b;
double c;
}variable;
int main(){
double s,p;
scanf("%lf %lf %lf",&variable.
a,&variable.
b,&variable.
c); p=(variable.a+variable.b+variable.c)/2;
s
=sqrt(p
*(p
-variable.
a)*(p
-variable.
b)*(p
-variable.
c)); printf("a=%.0lf \nb=%.0lf \nc=%.0lf \ns=%lf",variable.
a,variable.
b,variable.
c,s
); return 0;
}
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