greatest among four numbers C-Program

#include<stdio.h>
#include<conio.h>
main()
{
int a,b,c,d;
printf("input four different numbers=");
scanf("%d %d %d %d",&a,&b,&c,&d);
if(a>b&&a>c&&a>d)
{
printf("%d is the greatest number",a);
}
else if(b>c&&b>d)
{
printf("%d is the greatest number",b);
}
else if(c>d)
{
printf("%d is the greatest number",c);
}
else
{
printf("%d is the greatest number",d);
}
}