[백준] 5565번 : 영수증 - Dart(다트)

https://www.acmicpc.net/problem/5565

import 'dart:io';
void main(){
    int sum=int.parse(stdin.readLineSync()!);
    for(int i=0;i<9;i++){
        int a=int.parse(stdin.readLineSync()!);
        sum-=a;
    }
    print(sum);
}