#include <stdio.h>
#include <math.h>
int main(){
int a,b,c;
double area=0,perimeter=0;
double s;
if (scanf("%d",&a)!=EOF && scanf("%d",&b)!=EOF && scanf("%d",&c)!=EOF && (a+b)>c && (a+c)>b && (b+c)>a){
// 计算最大的5分钱个数
s = (a+b+c)/2.0;
area = sqrt(s*(s-a)*(s-b)*(s-c));
perimeter = a+b+c;
printf("area = %.2f; perimeter = %.2f",area,perimeter);
}else{
printf("These sides do not correspond to a valid triangle");
}
return 0;
}
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