#include <stdio.h>

int main(void) {
	
	float a, b, c, d;
	float calc;
	
	printf("Enter value of variable a: ");
	scanf("%f", &a);
	
	printf("Enter value of variable b: ");
	scanf("%f", &b);
	
	printf("Enter value of variable c: ");
	scanf("%f", &c);
	
	printf("Enter value of variable d: ");
	scanf("%f", &d);

	calc = ((a-b)*(c-d))/((a+d));

	printf("The result is: %.2f\n", calc);
	
	return 0;

}