C program to find largest of three numbers using pointer

#include<stdio.h>
int main()
{
    int *p1,*p2,*p3,a,b,c;
    p1=&a;
    p2=&b;
    p3=&c;
    printf("\n enter three number:");
    scanf("%d%d%d",p1,p2,p3);
    if(*p1>*p2)
        if(*p1>*p3)
          printf("maximum is %d",*p1);
        else
          printf("maximum is %d",*p3);
    else
    {     
       if(*p2>*p3)
         printf("maximum is %d",*p2);
       else
         printf("maximum is %d",*p3);
    }
    return 0;
}