Problem:
Score : 100 points

Problem Statement

We will buy a product for N yen (the currency of Japan) at a shop.

If we use only 1000-yen bills to pay the price, how much change will we receive?

Assume we use the minimum number of bills required.

Constraints

1 \leq N \leq 10000

N is an integer.

Input

Input is given from Standard Input in the following format:

N

Output

Print the amount of change as an integer.

Sample Input 1

1900

Sample Output 1

100

We will use two 1000-yen bills to pay the price and receive 100 yen in change.

Sample Input 2

3000

Sample Output 2

0

We can pay the exact price.

Solution in C (GCC 9.2.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>

int main(void){
  int N;
  int i1 = 0;
  int i2 = 0;
  int i3 = 0;
  int i4 = 0;
  scanf("%d",&N);
  for(int i = 0; i < N; i++){
    char str[3];
    scanf("%s", str);
    if(strcmp("AC", str) == 0){
      i1++;
    }else if(strcmp("WA", str) == 0){
      i2++;
    }else if(strcmp("TLE", str) == 0){
      i3++;
    }else if(strcmp("RE", str) == 0){
      i4++;
    }
  }
  printf("AC x %d\n",i1);
  printf("WA x %d\n",i2);
  printf("TLE x %d\n",i3);
  printf("RE x %d\n",i4);
  return 0;
}