#include <stdio.h>
#include <conio.h>
main()
{
	float a,b,c,d,e;
	printf("\n---------- Program : calculalate the area of a unequal sided triangle ----------\n");
	printf("\ninput a :");
	scanf("%f",&a);
	printf("\ninput b :");
	scanf("%f",&b);
	printf("\ninput c :");
	scanf("%f",&c);
	printf("\ninput d :");
	scanf("%f",&d);
	e=a*b*c*d;
	printf("\nResult : %.2f",e);
	printf("\n---------- By : Tada Salangsing No.15 ----------");