参考答案：

#include<iostream>
using namespace std;
const int N = 100010;
int n,i;
int a[N];
int sum;

int main()
{
    cin >> n;
    for (i = 1; i <= n; ++i) cin >> a[i];
    for (i = 1; i <= n; ++i)
    {
        if (a[i] == 25) sum += a[i];
        else sum = sum + 25 - a[i];
        if (sum < 0)
        {
            cout << "NO";
            break;
        }
    }
    if (i - 1 == n) cout << "YES";

    return 0;
}