discount sum, C (vc)

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#include<stdio.h>

int main() 
{
	int a,b,c,d,e,f,g=0;
	int i;
	printf("enter the no f items\n");
	scanf("%d",&a);
    if(a<0)
    {
        printf("no bill");
    }
    else
    {
	    for(i=1;i<=a;i++)
	           {
	            printf("enter the no f units for item %d\n",i);
	            scanf("%d",&b);
	            printf("enter the price for item %d\n",i);
	            scanf("%d",&c);
	            d=b*c;
                g=g+d;
               }
        if(b<0)
        {
            
              printf("cannot generate");
        }
        else if(c<0)
            {
            printf("invalid amount");
            }
            else
            {
               printf("balance amount Rs.%d\n",g);
	           if(g>=5000)
	           {
	           e=g*0.10;
	           }
	           else if(g<5000 && g>2500)
	           {
	           e=g*0.07;
	           }
	           else
	           {
	           e=g*0.05;
               }  
               printf("total disount amount Rs.%d\n",e);
               f=g-e;
	           printf("total amount to b paid is Rs.%d",f); 
         
            }
}
}

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Compilation time: 1,52 sec, absolute running time: 0,32 sec, absolute service time: 1,86 sec