#include
main()
{
int a,b,c,d,max;
printf("\n nhap so thu nhat=");
scanf("%d",&a);
printf("\n nhap so thu hai=");
scanf("%d",&b);
printf("\n nhap so thu ba=");
scanf("%d",&c);
printf("\n nhap so thu tu=");
scanf("%d",&d);
max=a;
if(a>b)
max=b;
if(b>c)
max=c;
if(c>d)
max=d;
printf("\n so lon nhat=%d",max);
getchar()
}