#include <stdio.h>
#include <conio.h>
void main()
{
    int calls, bill=0;
    printf("Enter the number of calls");
    scanf("%d",&calls);
             
      if(calls<=200)
        bill=0;
      if(calls>200&& calls<=500)
        bill=200*0+ (calls-200)*1;
      if(calls>500)
        bill=200*0+300*1+(calls-500)*2;
    bill=bill+200; // 200 rental is added.
    printf("the final bill =%d",bill);
}