#include <stdio.h>
#include <conio.h>

//nhap vao 4 so nguyen a,b,c,d ,in ra man hinh ket qua so lon nhat nho nhat 
int main()
{    
	int a,b,c,d;

	printf("\nhay nhap vao so nguyen a :  ");
	scanf("%d",&a);

	printf("\nhay nhap vao so nguyen b : ");
	scanf("%d",&b);

	printf("\nhay nhap vao so nguyen c : ");
	scanf("%d",&c);

	printf("\nhay nhap vao so nguyen d : ");
	scanf("%d",&d);

	int max = a  , min = a;

	if (max < b )
	{
	   max = b;
	}
	if (max < c)
	{
	   max = c;
	}
	if (max < d)
	{
	   max = d;
	}
	if ( min > b)
	{
	   min = b;
	}
	if(min > c)
	{
	   min = c;
	}
	if(min > d)
	{
	  min = d;
	}
	
	printf("\ntong 4 so lon nhat la : %d",max);

	printf("\ntong 4 so nho nhat la : %d",min);
   	
		
	   
   getch();
   return 0;


}