#include <stdio.h>
#include <conio.h>
main()
{
	printf("\n---------- Program : calculatating the area of a trapezium ----------\n");
    float a,b,c,d,e;
	printf("Input A :");
	scanf("%f",&a);
    printf("Input B :");
	scanf("%f",&b);
	printf("Input C :");
	scanf("%f",&c);
	printf("Input D :");
	scanf("%f",&d);
	e=a*b*c*d;
	printf("Result : %.1f",e);
	printf("\n---------- Program By praewpraewa ----------");
}