For problem statement at 0-999/400-499/430-439/433/problemA.txt this is a correct solution, but verifier at 0-999/400-499/430-439/433/verifierA.go ends with All 100 tests passed. can you fix the verifier? package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	in := bufio.NewReader(os.Stdin)
	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	var n int
	if _, err := fmt.Fscan(in, &n); err != nil {
		return
	}
	a, b := 0, 0
	for i := 0; i < n; i++ {
		var w int
		fmt.Fscan(in, &w)
		if w == 100 {
			a++
		} else if w == 200 {
			b++
		}
	}
	if a%2 == 1 {
		fmt.Fprintln(out, "NO")
	} else if a == 0 && b%2 == 1 {
		fmt.Fprintln(out, "NO")
	} else {
		fmt.Fprintln(out, "YES")
	}
}