Write a program ATM money dispatch count while currencies are 1000,500 and 100

#include<stdio.h>
#include<conio.h>
int totalThousand =1000; 
int totalFiveFundred =1000; 
int totalOneHundred =1000;
void main(){
    unsigned long withdrawAmount;
    unsigned long totalMoney;
    int thousand=0,fiveHundred=0,oneHundred=0;
    clrscr();
    printf("Enter the amount in multiple of 100: ");
    scanf("%lu",&withdrawAmount);
    if(withdrawAmount %100 != 0){
     printf("Invalid amount;");
     getch();
     return;
    }
    totalMoney = totalThousand * 1000 + totalFiveFundred* 500 +  totalOneHundred*100;
    if(withdrawAmount > totalMoney){
     printf("Sorry,Insufficient money");
     getch();
     return;
    }
    thousand = withdrawAmount / 1000;
    if(thousand > totalThousand)
         thousand = totalThousand;
    withdrawAmount = withdrawAmount - thousand * 1000;
    if (withdrawAmount > 0){
         fiveHundred = withdrawAmount / 500;
         if(fiveHundred > totalFiveFundred)
             fiveHundred = totalFiveFundred;
         withdrawAmount = withdrawAmount - fiveHundred * 500;
    }
    if (withdrawAmount > 0)
         oneHundred = withdrawAmount / 100;
    printf("Total 1000 note: %d\n",thousand);
    printf("Total  500 note: %d\n",fiveHundred);
    printf("Total  100 note: %d\n",oneHundred);
    getch();
}


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