#include <stdio.h>
#include <math.h>	//加载math头文件

int main()
{
	int a, b, c;

	printf("Enter three integers: ");
	scanf_s("%d %d %d", &a, &b, &c);

	double s = (a + b + c) / 2.0;

	double finnal = sqrt(s * (s - a) * (s - b) * (s - c));

	printf("The area of the triangle is: %.2lf\n", finnal);

	return 0;

}