1350번: 진짜 공간

#include<iostream>
#include<vector>
using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n, clusterSize;
    long long int result = 0;
    vector<int> fileSize;
    cin >> n;
    for (int i = n, temp; i--; fileSize.push_back(temp))
        cin >> temp;
    cin >> clusterSize;
    for (int i = 0; i < n; ++i)
    {
        if (fileSize[i] == 0)
            continue;
        long long int t = fileSize[i] / clusterSize;
        if (fileSize[i] % clusterSize != 0)
            ++t;
        result += t * clusterSize;
    }
    cout << result;
}