最后一个点WA怎么办

#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int a[1005]; 
int main()
{
	int n;
	for(int i = 0;i<10;i++)
	{
		cin >> n;
		a[i] = n;
	}
	int x;
	cin >> x;
	x = x + 30;
	int sum,b;
	for(int i = 0;i<10;i++)
	{
		b = a[i];
		if (x > b)
		{
			sum += 1;
		}
	}
	cout << sum;
}