float a,b,c,d,max,min,mid, total,middle;
	printf("Ââåäèòå a : ");
	scanf("%lf",&a);
	printf("\nÂâåäèòå b : ");
	scanf("%lf",&b);
	printf("\nÂâåäèòå c	 : ");
	scanf("%lf",&c);
	printf("\nÂâåäèòå d	 : ");
	scanf("%lf",&d);
					max=a;//x - max
			if (c>max) max=c;
			if (5>max) max=5;
			min = a;//min = x
			if (b<min) min=b;
			if (c<min) min=c;
			mid = a+b+c-max-min;//mid
			middle = (a+b+d) /3;
			total= mid*max/min;
			printf("%lf",total);